{"type":"doc","content":[{"type":"heading","attrs":{"id":"3f100236-1286-424a-b164-a838a4a73797","textAlign":"inherit","indent":0,"level":1,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"d电子重费米子的发现范式Cr掺杂CsFe2As2中的轨道选择性关联增强"}]},{"type":"paragraph","attrs":{"id":"64dbe1f0-d35b-4fdd-972b-9d33838f6c58","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"PHYS. REV. LETT. 134, 076504 (2025)"}]},{"type":"paragraph","attrs":{"id":"ac5a573f-a9ca-4813-b073-eab8c0664573","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"ted电子重费米子的发现新范式：Cr掺杂CsFe2As2中的轨道选择性关联增强 寻找d电子重费米子的范式 导读：重费米子行为几乎几乎都出现在f电子体系中，而d电子重费米子非常少见。本文提出并通过实验验证了一种寻找d电子重费米子的通用思路：在Hund金属CsFe2As2中，通过Cr掺杂将体系推向half-filling。g推进，利用轨道选择性关联增强，迫使部分Fe-3d轨道局域化，形成d轨道间的Kondo杂化。实验获得铁基超导体中最高的Sommerfeld系数（gamma=270 mJ/mol K^2），并构建了完整的Doniach型相图。这一工作为d电子重费米子材料的设计开辟了新范式。"}]},{"type":"image","attrs":{"id":"806705d6-bd9f-4b7a-94cb-c931bd347896","src":"https://developer.qcloudimg.com/http-sa ve/audit-12559234/b2db97cb01d6ae62b397e07c795a977d.webp","extension":"","align":"center","alt":"","showAlt":false,"href":"","boxShadow":"","width":"","aspectRatio":0,"status":"success","showText":true,"isPercentage":false,"percentage":0,"isHoverDragHandle":false}},{"type":"paragraph","attrs":{"id":"9588e4c0-7c3c-49b9-8bd9-9ce3f7faa516","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"一、前言背景"}]},{"type":"paragraph","attrs":{"id":"c40b4b63-ebb0-4bd5-921b-6689efc5ee71","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"重费米子：从f电子到d电子"}]},{"type":"paragraph","attrs":{"id":"4018178e-170f-4b8c-a393-9bdd687b6742","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"重费米子（hea vy fermion）材料是强关联电子体系的经典代表，其特征是低温下有效质量m*可达自由电子质量的100-1000倍，Sommerfeld系数gamma极大（>400 mJ/mol K^2）。传统重费米子体系几乎全部基于f电子（Ce、Yb、U等稀土/锕系元素），其中局域f电子通过Kondo效应与巡游电子杂化，形成重准粒子。"}]},{"type":"paragraph","attrs":{"id":"79d028c9-a30a-4f21-af0f-ff9ff78e6102","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"然而，d电子体系的重费米子行为极为罕见。d电子比f电子更扩展，通常不易局域化，但Hund耦合金属（Hund metal）中的轨道选择性Mott相变（OSMT）为d电子重费米子提供了新机制。"}]},{"type":"paragraph","attrs":{"id":"f2c8f2c8-cc3b-416b-8196-253b7bae284e","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"本文提出并验证了寻找d电子重费米子的通用策略：在Hund金属中通过掺杂向half-filling推进，利用轨道选择性关联增强，迫使部分d轨道局域化，形成"d电子提供的重费米子态"。"}]},{"type":"paragraph","attrs":{"id":"5e77c15d-45d1-41d9-83d7-57095d7a2057","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"Cr掺杂CsFe2As2：Hund金属中的重费米子"}]},{"type":"paragraph","attrs":{"id":"f271ec82-60eb-4eb8-9b51-1008f079a484","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"CsFe2As2是典型的Hund金属，Fe-3d电子处于半满的half-filling状态（~5.5 electrons/Fe）。通过Cr掺杂引入空xue，将体系推向half-filling，增强轨道选择性关联效应。"}]},{"type":"paragraph","attrs":{"id":"abe57a6d-6b0c-4bcb-af91-457c721cd0bc","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"核心发现：(1) Cr掺杂将Sommerfeld系数gamma从~30 mJ/mol K^2提升至~270 mJ/mol K^2--铁基超导体中的最高值；(2) 输运性质和磁化率符合重费米子Fermi液体行为；(3) 在更高掺杂量下出现反铁磁序，形成Doniach型相图。"}]},{"type":"paragraph","attrs":{"id":"55d27a95-68d2-4591-b27e-975a460bc2df","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"二、研究方法"}]},{"type":"paragraph","attrs":{"id":"53bce910-3d57-44da-a050-2362ecbcc411","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"理论框架：Hund金属 轨道选择性Mott转变"}]},{"type":"paragraph","attrs":{"id":"ffa7ad22-1355-40c5-b43b-a44558ce9fe6","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"Hund金属是一类多轨道关联体系，其中Hund耦合J_H增强了轨道自由度的关联效应。在Hund金属中，不同轨道可以具有截然不同的关联强度--部分轨道局域化（轨道选择性Mott相），部分轨道保持巡游。"}]},{"type":"paragraph","attrs":{"id":"bab7bf60-4246-4bec-ac3f-4dfb41b9a76b","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"当体系向half-filling推进时，Hund耦合驱动的轨道选择性关联增强，局域轨道与巡游轨道之间的杂化产生Kondo型重费米子行为。与f电子重费米子的关键区别：这里的"局域"和"巡游"电子都来自d轨道，只是不同的轨道自由度。"}]},{"type":"paragraph","attrs":{"id":"d93a2f1b-5b1d-4d06-b47b-455718cc92de","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDFT+DMFT（动力学平均场）是解决这类问题的标准方案。DFT负责提供能带结构，DMFT则用于描述局域关联效应，二者通过自洽方式进行耦合。"","background":""}}],"text":"Sommerfeld系数：正比于Fermi面态密度，有效质量m*的增强直接反映在gamma中"}]},{"type":"image","attrs":{"id":"ff2ef121-b764-4c62-9909-5ec4e7a5118e","src":"https://developer.qcloudimg.com/http-sa ve/audit-12559234/0e86e2a6ef3e8de2680e24cb391110ae.webp","extension":"","align":"center","alt":"","showAlt":false,"href":"","boxShadow":"","width":"","aspectRatio":0,"status":"success","showText":true,"isPercentage":false,"percentage":0,"isHoverDragHandle":false}},{"type":"paragraph","attrs":{"id":"41624cd0-df5a-4b96-9f4c-189dcbf9f54f","textAlign":"center","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"Wilson比率：磁化率与比热的比值，重费米子Fermi液体中R_W~2"}]},{"type":"image","attrs":{"id":"e0d3f93a-0dd4-4e49-a4f6-09e3bdd71148","src":"https://developer.qcloudimg.com/http-sa ve/audit-12559234/4b213f3b883f8e14091a97a08425474d.webp","extension":"","align":"center","alt":"","showAlt":false,"href":"","boxShadow":"","width":"","aspectRatio":0,"status":"success","showText":true,"isPercentage":false,"percentage":0,"isHoverDragHandle":false}},{"type":"paragraph","attrs":{"id":"9c820ae6-db8b-41fc-97cd-527ad20fe213","textAlign":"center","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"Doniach相图：Kondo温度T_K与RKKY温度T_RKKY的竞争，决定重费米子态vs磁有序"}]},{"type":"paragraph","attrs":{"id":"745a33fc-1500-451e-90d8-5169df17874e","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"三、核心结果"}]},{"type":"image","attrs":{"id":"14205fd5-cf62-43e0-9954-eff2b55a64df","src":"https://developer.qcloudimg.com/http-sa ve/audit-12559234/703e625ef6f5d03b92cbaffab5b89441.webp","extension":"","align":"center","alt":"","showAlt":false,"href":"","boxShadow":"","width":"","aspectRatio":0,"status":"success","showText":true,"isPercentage":false,"percentage":0,"isHoverDragHandle":false}},{"type":"paragraph","attrs":{"id":"ba2d620e-0ccd-4c7d-9dea-6e109720d692","textAlign":"center","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"图 1：Sommerfeld系数gamma随空xue掺杂的变化。Cr掺杂CsFe2As2将gamma从~30 mJ/mol K^2提升至~270 mJ/mol K^2，为铁基超导体中最高值。虚线为理论预测的轨道选择性Mott转变趋势。"}]},{"type":"paragraph","attrs":{"id":"e7730f16-acfb-4583-b2e5-626318c77dd1","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"Sommerfeld系数的巨大增强"}]},{"type":"paragraph","attrs":{"id":"febda674-1910-4021-acb2-b368a50e3322","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"gamma从母体CsFe2As2的~30 mJ/mol K^2增加到Cr掺杂后的~270 mJ/mol K^2，增强近10倍。这一数值已进入重费米子区间（通常gamma>200 mJ/mol K^2即被视为重费米子）。"}]},{"type":"paragraph","attrs":{"id":"f6bb03a3-5e16-44f3-b130-7e2f3a3815f7","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"理论分析表明，gamma的增强主要来源于dxz/dyz轨道（Fe-3d的t2g轨道）的有效质量增加。这些轨道在half-filling附近趋于局域化，而dxy轨道保持巡游，形成了d轨道间的Kondo杂化。"}]},{"type":"paragraph","attrs":{"id":"a196d105-d4b4-4d7b-be94-fa5442ecc04a","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"这一机制与f电子重费米子类似：局域磁矩（d轨道）通过杂化与巡游电子（另一d轨道）耦合，产生重准粒子。"}]},{"type":"image","attrs":{"id":"ca576055-8e8b-46f4-a46e-2a84b97625dd","src":"https://developer.qcloudimg.com/http-sa ve/audit-12559234/217e0801dcf1408c78044d4f00f60c7a.webp","extension":"","align":"center","alt":"","showAlt":false,"href":"","boxShadow":"","width":"","aspectRatio":0,"status":"success","showText":true,"isPercentage":false,"percentage":0,"isHoverDragHandle":false}},{"type":"paragraph","attrs":{"id":"14c529b0-654e-4fa2-adc8-0b688da4d117","textAlign":"center","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"图 2：热力学和输运性质。(a) 电子比热Ce/T vs T^2；(b) 磁化率chi(T)；(c) 电阻率rho(T)。所有数据符合重费米子Fermi液体行为。"}]},{"type":"paragraph","attrs":{"id":"95287deb-b77a-42a3-90e3-f7776849b3ed","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"Fermi液体行为的实验验证"}]},{"type":"paragraph","attrs":{"id":"215d3257-54fd-46b9-acba-41f8ceb1e74d","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"比热：Ce/T vs T^2在低温下为线性，外推得到gamma值。在最低温下（<2 K），Ce/T趋于常数，是Fermi液体的标志。"}]},{"type":"paragraph","attrs":{"id":"f332d622-2779-46b7-bba5-4182a75ec835","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"磁化率：chi(T)在低温下趋于常数（Pauli顺磁），符合Fermi液体预期。Wilson比率R_W通过chi_0和gamma的比值计算，落在重费米子Fermi液体区间。"}]},{"type":"paragraph","attrs":{"id":"ec36b8ab-1b4a-4d85-87aa-ec671f3ab641","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"电阻率：rho(T)~T^2行为（Fermi液体特征），系数A与gamma^2成正比（Kadowaki-Woods关系），进一步确认重费米子态。"}]},{"type":"image","attrs":{"id":"c09f4de5-777a-45d0-b586-09e131f78bfa","src":"https://developer.qcloudimg.com/http-sa ve/audit-12559234/78ea08e12eda1ae5eb5dcdc57eebd762.webp","extension":"","align":"center","alt":"","showAlt":false,"href":"","boxShadow":"","width":"","aspectRatio":0,"status":"success","showText":true,"isPercentage":false,"percentage":0,"isHoverDragHandle":false}},{"type":"paragraph","attrs":{"id":"13c44543-64de-4cf1-b569-20ad7c36c5cb","textAlign":"center","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"图 3：(a) 理论Doniach相图，展示Kondo温度T_K和RKKY温度T_RKKY的竞争；(b) 实验(H,T)磁相图，显示反铁磁序在更高掺杂下的出现。"}]},{"type":"paragraph","attrs":{"id":"0d6710d3-26a5-4a6f-bef4-5df3099bf295","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"Doniach相图与磁有序"}]},{"type":"paragraph","attrs":{"id":"40a55dfe-4281-4f9c-9dbc-fbbf786a3f73","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"Doniach相图描述了重费米子体系中Kondo屏蔽（T_K~exp(-1/rho J)）与RKKY磁交换（T_RKKY~J^2 rho）的竞争。当T_K > T_RKKY时，体系为重费米子Fermi液体；当T_RKKY > T_K时，体系为磁有序态。"}]},{"type":"paragraph","attrs":{"id":"b2cacd82-338f-4058-b19f-e49e0854ecb6","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"在Cr掺杂CsFe2As2中，低掺杂区（x<0.3）为重费米子态，高掺杂区出现反铁磁序。这符合Doniach相图的预期：向half-filling推进时，RKKY相互作用增强，最终超过Kondo屏蔽。"}]},{"type":"paragraph","attrs":{"id":"e0384f11-3a78-4118-b6ed-ff25cf7ca854","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"实验(H,T)相图显示反铁磁转变温度T_N~40 K，且随磁场增加而降低，与巡游反铁磁体的预期一致。"}]},{"type":"paragraph","attrs":{"id":"ee8adafa-fa63-4f6d-a804-9c1ea83b9639","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"DFT Tips"}]},{"type":"paragraph","attrs":{"id":"c885412d-7be5-4576-8d7f-be82b55889a9","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【DFT Tip 1】DFT DMFT：处理强关联体系的正确姿势"}]},{"type":"paragraph","attrs":{"id":"ff2d0310-69d8-4458-962e-28cea8bbc1b5","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"Hund金属和重费米子体系不能仅用DFT描述。DFT会严重低估d/f电子的关联效应，导致错误的能带结构和有效质量。DFT DMFT是处理这类体系的标准方法。"}]},{"type":"paragraph","attrs":{"id":"6c9552ad-ddf3-4a18-ae11-b6a2843bd707","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"基本流程：(1) DFT计算能带结构（VASP/WIEN2k）；(2) 用Wannier90构建紧束缚模型；(3) 将TB模型输入DMFT求解器（如TRIQS/EDMFT/w2dynamics）；(4) 自洽更新自能和化学势。"}]},{"type":"paragraph","attrs":{"id":"1f333231-6c3f-486f-a687-5787eb5ce503","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"关键参数：Hubbard U=3-5 eV for Fe-3d, Hund J_H=0.7-0.9 eV。U和J_H的值可以通过cRPA方法从第一性原理计算得到，比经验值更可靠。"}]},{"type":"paragraph","attrs":{"id":"3366d1d7-a0e7-4458-bc52-9d7f77a336e2","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【DFT Tip 2】轨道选择性Mott转变的DFT特征：轨道分辨能带"}]},{"type":"paragraph","attrs":{"id":"41500ad9-c0c1-45e6-a6ae-e578a433f39d","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"轨道选择性Mott转变（OSMT）是Hund金属的核心特征。在OSMT中，部分轨道（如dxz/dyz）局域化，形成Mott绝缘体行为，而其他轨道（如dxy）保持金属性。"}]},{"type":"paragraph","attrs":{"id":"ed866aed-b75e-4e7c-b994-0736cf7a0870","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"DFT DMFT诊断OSMT：(1) 计算轨道分辨的谱函数A(omega)；(2) 检查各轨道在Fermi面处的谱权重--局域化轨道的谱权重在Fermi面处显著降低；(3) 计算轨道分辨的自能虚部Im Sigma(omega=0)--大虚部表示强关联。"}]},{"type":"paragraph","attrs":{"id":"864e4233-e80e-4a4c-8163-6dc02ad973e3","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"常见错误：仅看DFT能带就声称OSMT--DFT无法正确描述轨道选择性的关联效应，必须用DMFT。"}]},{"type":"paragraph","attrs":{"id":"76b6e464-3584-4b1c-bbf2-db8cbf34534c","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【DFT Tip 3】CsFe2As2的DFT计算：Fe-3d的Hubbard U"}]},{"type":"paragraph","attrs":{"id":"fdcaffbc-b3cc-4e25-a8a7-45f1bd457d9c","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"CsFe2As2是铁基超导体家族成员，Fe-3d电子需要适当的Hubbard U修正。U值过小-->低估关联效应，U值过大-->虚假Mott绝缘体。"}]},{"type":"paragraph","attrs":{"id":"e34378f8-a403-49f8-b194-5703559d9298","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"推荐U值：PBE U中Ueff=3-4 eV for Fe-3d。建议通过cRPA计算（VASP的LDAUTYPE=3）自洽确定U值，或与实验XPS/ARPES能带对比校准。"}]},{"type":"paragraph","attrs":{"id":"c53476cc-738f-46ef-8a3b-ac3a052e47cd","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"注意：铁基超导体中Fe-3d的U值通常在3-5 eV范围，但具体值依赖于泛函（PBE vs PBEsol）、赝势和结构。不同铁基材料（如BaFe2As2、FeSe）的U值可能不同。"}]},{"type":"paragraph","attrs":{"id":"d59d893e-2ddf-498f-90be-97bbeb29575b","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【DFT Tip 4】Cr掺杂DFT计算：超胞与虚拟晶体近似"}]},{"type":"paragraph","attrs":{"id":"cf95388e-2e5a-415c-83a9-fbff0a193e8d","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"Cr掺杂CsFe2As2的DFT计算面临掺杂建模的挑战。两种主要方法：(1) 超胞法--构建大超胞，用Cr原子替换特定位置的Fe原子；(2) 虚拟晶体近似（VCA）--在赝势中混合Fe和Cr的原子序数。"}]},{"type":"paragraph","attrs":{"id":"a971ece7-d815-443f-aa8f-bdd851b21498","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"超胞法更准确但，VCA更简便但可能丢失局域无序效应。对于重费米子行为，电子结构对局域环境敏感，推荐使用超胞法（至少2x2x2超胞）。"}]},{"type":"paragraph","attrs":{"id":"c5d273df-3bf7-4b9d-973b-f2165f2b89ba","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"建议：比较不同Cr掺杂浓度（x=0.1, 0.2, 0.3, 0.5）的超胞计算结果，验证gamma增强趋势的一致性。"}]},{"type":"paragraph","attrs":{"id":"5f5584d3-2c77-4db4-8493-c7731432c9bd","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【DFT Tip 5】Sommerfeld系数的DFT计算：态密度 有效质量"}]},{"type":"paragraph","attrs":{"id":"fca7dd3e-8d6a-42e1-8619-604e3c3af3d9","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"Sommerfeld系数gamma=(pi^2/3)k_B^2 N(E_F)，其中N(E_F)为Fermi面态密度。DFT可以直接计算N(E_F)并估算gamma。"}]},{"type":"paragraph","attrs":{"id":"d53286f9-53f8-4c90-8fbf-e7d832290a69","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"但DFT的gamma通常被严重低估（因为关联效应未包含），DFT DMFT的gamma更接近实验。在DMFT中，gamma可以从自能修正后的有效质量m*/m=1-dRe Sigma/domega|_EF计算。"}]},{"type":"paragraph","attrs":{"id":"c1e66457-53a6-488c-b9bf-5c62f0258c53","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"验证：将DFT DMFT预测的gamma与实验比热数据对比，是验证理论框架正确性的关键步骤。"}]},{"type":"paragraph","attrs":{"id":"58f309b0-153c-4a6e-ae1c-f9895be82e83","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【DFT Tip 6】Kadowaki-Woods关系的DFT验证"}]},{"type":"paragraph","attrs":{"id":"6df5f221-2d21-44c2-8387-150264464ad7","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"Kadowaki-Woods关系A/gamma^2=常数是重费米子Fermi液体的标志。A为电阻率rho~AT^2的系数，gamma为Sommerfeld系数。"}]},{"type":"paragraph","attrs":{"id":"91cab1b2-b26d-4c88-9dfa-c8607d4ff81b","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"DFT DMFT可以同时计算A和gamma：(1) gamma从有效质量增强得到；(2) A从DMFT的输运计算得到（Kubo公式）。"}]},{"type":"paragraph","attrs":{"id":"c16f1d6d-f0ec-4b41-835f-d5d2b4a9b13c","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"注意：A/gamma^2的比值与轨道简并度N有关--对于N=1的Kondo晶格，A/gamma^2~1e-5 muOhm cm (mol K/mJ)^2；对于N=2，比值约为其1/4。"}]},{"type":"paragraph","attrs":{"id":"c4cd74c0-041c-4f75-9e06-748537f9ec4d","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【DFT Tip 7】Hund耦合J_H对轨道选择性的影响"}]},{"type":"paragraph","attrs":{"id":"1e76d370-93ee-4abe-b3eb-0208f2752e1c","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"Hund耦合J_H是Hund金属中轨道选择性的驱动力。J_H越大，轨道选择性越强，部分轨道越容易局域化。"}]},{"type":"paragraph","attrs":{"id":"1a1b7328-402b-437d-b653-a3f9110158be","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"在DFT DMFT中，J_H通常取0.7-0.9 eV for Fe-3d（与原子物理值一致）。但需注意：J_H对结果的影响与U相当，需要做J_H的收敛性测试。"}]},{"type":"paragraph","attrs":{"id":"77ca7f88-28c2-4f36-8813-94ca7c2d2657","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"建议：在U=3-5 eV范围内，J_H=0.7-0.9 eV范围内，做U-J_H参数扫描，验证轨道选择性和重费米子行为的鲁棒性。"}]},{"type":"paragraph","attrs":{"id":"4bf30f08-67fa-4d1b-b3d3-59760e2c8083","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【DFT Tip 8】Wannier90构建Fe-3d轨道模型：投影选择"}]},{"type":"paragraph","attrs":{"id":"0db1c08b-f02d-4f50-84d0-a5248e6e07cf","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"从DFT到DMFT的关键步骤是构建Wannier紧束缚模型。对于CsFe2As2，需要投影Fe-3d轨道（五个d轨道：dxy, dyz, dxz, dx^2-y^2, dz^2）和As-4p轨道。"}]},{"type":"paragraph","attrs":{"id":"0e2d22a9-51bb-42a6-bb6b-e3f03fe8a25d","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"Wannier90设置：(1) 初始投影选择Fe的d轨道和As的p轨道；(2) 纠缠能窗覆盖Fermi面上下的2-3 eV能带；(3) 验证TB模型与DFT能带的一致性（偏差<10 meV）。"}]},{"type":"paragraph","attrs":{"id":"6aa7e3d1-f173-4fb1-a614-ee60885ccf89","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"常见错误：只投影Fe-3d而忽略As-4p，导致Fe-As杂化信息丢失，DMFT结果不准确。"}]},{"type":"paragraph","attrs":{"id":"5fcbacec-886a-458e-8b66-2c9395e3686b","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【DFT Tip 9】铁基超导体的磁性：条纹反铁磁序"}]},{"type":"paragraph","attrs":{"id":"02c7e7d4-1a2b-4b68-833a-564b90ae058e","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"铁基超导体中常见的磁序是条纹反铁磁（stripe AFM），即沿一个方向铁磁排列、垂直方向反铁磁排列。在DFT中，需要构建相应的磁超胞。"}]},{"type":"paragraph","attrs":{"id":"04692023-95d3-48bf-b926-a27f5994a3bf","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"对于CsFe2As2，磁序对电子结构有显著影响--条纹AFM序打开Fermi面nesting能隙，显著改变态密度和gamma值。"}]},{"type":"paragraph","attrs":{"id":"16a3cbcc-5b59-4fd3-9d1f-6be98f6e8c39","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"建议：(1) 比较非磁和条纹AFM态的总能量，确认磁基态；(2) 在磁基态上计算DMFT，得到更准确的gamma和有效质量。"}]},{"type":"paragraph","attrs":{"id":"f68ad353-3009-454f-a04c-281600e9393c","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【DFT Tip 10】重费米子态的ARPES特征：DFT辅助谱学分析"}]},{"type":"paragraph","attrs":{"id":"22592758-5ab6-4741-bc5c-7cd04d1563b2","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"重费米子态在ARPES中有独特的谱学特征：Fermi面附近出现重准粒子峰（窄峰） Hubbard带（宽峰）。DFT DMFT可以预测这些谱学特征。"}]},{"type":"paragraph","attrs":{"id":"6cf786ae-618e-4c7c-a25f-51c57658f196","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"计算流程：(1) DMFT自洽计算得到自能Sigma(omega)；(2) 用自能修正构造谱函数A(k,omega)；(3) 模拟ARPES谱（包含矩阵元效应和分辨率展宽）。"}]},{"type":"paragraph","attrs":{"id":"8d576d43-d2d2-4154-a59c-0f29045b46de","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"注意：重费米子态的特征温度（相干温度T_coh）通常在10-100 K量级，ARPES测量需要在足够低的温度下进行。"}]},{"type":"paragraph","attrs":{"id":"57a25f5d-d578-4825-ba09-58eddcaac721","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"知识扩展"}]},{"type":"paragraph","attrs":{"id":"7257a5f6-d621-418a-80b8-c5cc363beb4f","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【知识扩展 1】重费米子：Kondo晶格与Doniach相图"}]},{"type":"paragraph","attrs":{"id":"0574f501-da06-4dd1-b1b3-7f899a7c4728","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【理论解释】重费米子体系的核心物理是Kondo晶格问题：周期性排列的局域磁矩通过Kondo效应与巡游电子杂化，形成重准粒子。Kondo温度T_K标志了局域磁矩被巡游电子屏蔽的能标，Fermi液体相干温度T_coh标志了重准粒子形成的温度。"}]},{"type":"paragraph","attrs":{"id":"08a96c6a-6a50-4b92-839b-6cbb55137707","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【Doniach相图】Doniach（1977）提出了描述Kondo晶格中Kondo屏蔽与RKKY磁交换竞争的经典相图。当交换耦合J很小时，T_RKKY > T_K，体系为磁有序态；当J增大到临界值时，T_K > T_RKKY，体系为顺磁重费米子态。两者之间的量子临界点（QCP）是重费米子研究的核心。"}]},{"type":"paragraph","attrs":{"id":"30de35fd-2364-45b5-befe-29f075c05c16","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【经典体系】CeCu6（gamma~1600 mJ/mol K^2）、CeAl3（gamma~1620）、YbRh2Si2（QCP附近的非Fermi液体）、URu2Si2（隐藏序）。"}]},{"type":"paragraph","attrs":{"id":"257050b4-8cfb-44ff-a0fc-663d7ee8949f","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【经典参考】Hewson, "The Kondo Problem to Hea vy Fermions" (1993)；Coleman, "Hea vy Fermions: Electrons at the Edge of Magnetism" (2007)；Stewart, RMP 56, 755 (1984)。"}]},{"type":"paragraph","attrs":{"id":"cf299b8c-6b49-46fb-a31d-289c7ea7159b","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【知识扩展 2】Hund金属与轨道选择性Mott转变"}]},{"type":"paragraph","attrs":{"id":"354974a1-2edd-4105-98c2-46d10a3bd673","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【理论解释】Hund金属是多轨道关联电子体系，其中Hund耦合J_H（而非单纯的Hubbard U）是关联效应的主要驱动力。J_H将不同轨道的电子自旋对齐，降低动能，增强关联效应。在Hund金属中，不同轨道可以具有截然不同的关联强度--轨道选择性Mott转变（OSMT）。"}]},{"type":"paragraph","attrs":{"id":"3f4fd81d-58e3-4d36-a174-7f1cee60ce1a","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【与Mott绝缘体的区别】传统Mott绝缘体（如VO2、NiO）由Hubbard U驱动，所有轨道同时局域化。Hund金属的OSMT是部分轨道局域化，部分轨道保持巡游--这是"坏金属"行为（rho(T)在高温下饱和）的微观起源。"}]},{"type":"paragraph","attrs":{"id":"ea51bcba-458f-40b5-a5c0-a4600df765f2","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【经典参考】de Medici et al., PRL 107, 256401 (2011); Georges et al., RMP 85, 421 (2013)--Hund金属综述; Yin et al., PRL 107, 216401 (2011)--铁基超导体中OSMT的DMFT证据。"}]},{"type":"paragraph","attrs":{"id":"3e4868c0-ee95-4654-b7f7-db0aae5cae2b","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【迁移能力】Hund金属 OSMT框架适用于所有多轨道关联体系：铁基超导体、钌氧化物（Sr2RuO4）、铬氧化物（CrO2）、铁氧体等。"}]},{"type":"paragraph","attrs":{"id":"db9ffd11-8656-4f04-b44b-34508d003e29","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"科研经验"}]},{"type":"paragraph","attrs":{"id":"e469d256-ab81-4e2b-860c-6b6b09d8385a","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【科研经验 1】DFT DMFT收敛性：自洽循环的陷阱"}]},{"type":"paragraph","attrs":{"id":"984dad1b-3b74-413c-9d0e-12037c4f8699","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"问题：DFT DMFT自洽计算不收敛，自能和化学势在迭代中振荡。"}]},{"type":"paragraph","attrs":{"id":"fcf832e2-a3c3-4e38-8527-9843a87110c9","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"原因：(1) 轨道间电荷转移的过度响应--DMFT更新自能后，DFT计算给出大幅变化的电荷密度，导致下一步DMFT的自能又大幅变化；(2) 化学势调整步长太大。"}]},{"type":"paragraph","attrs":{"id":"f4305333-a746-456e-b572-b351c4ef5382","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"解决方案：(1) 使用混合（mixing）技术--新自能=alpha*新算 (1-alpha)*旧自能，alpha=0.3-0.5；(2) 逐步减小化学势调整步长；(3) 在DMFT中增加Monte Carlo采样数，减小统计噪声。"}]},{"type":"paragraph","attrs":{"id":"f0535092-17af-4f3e-9718-5a5503db208d","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"建议：DFT DMFT的收敛是计算中最耗时的步骤。建议从较小的U值开始，逐步增大U，用前一个U的收敛解作为初始猜测。"}]},{"type":"paragraph","attrs":{"id":"2d3589d7-0cc2-436d-aa24-40e2c6b1e7c6","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"【科研经验 2】实验与理论的对比：如何判断重费米子态"}]},{"type":"paragraph","attrs":{"id":"d8c99b6a-371a-4510-ab08-0ddef737c3dc","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"问题：实验中观察到gamma增强，如何判断是否真的进入了重费米子态？"}]},{"type":"paragraph","attrs":{"id":"9782c1c2-bf09-4d4a-a7a4-08ff3fe7f2d2","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"判断标准（至少满足3条）：(1) gamma > 200 mJ/mol K^2；(2) Wilson比率R_W在1-3之间；(3) 电阻率rho~AT^2，且A/gamma^2满足Kadowaki-Woods关系；(4) 磁化率chi在低温下趋于常数（Pauli顺磁）；(5) 低温比热中间出现Schottky异常（来自局域磁矩的激发）。"}]},{"type":"paragraph","attrs":{"id":"a8529905-9faa-48c7-8c66-625b4424192f","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"排除效应：gamma增强也可能来自磁涨落（非Fermi液体）或剩余Schottky贡献。需要结合多种测量手段，排除这些可能性。"}]},{"type":"paragraph","attrs":{"id":"07f0fe1b-a62c-4276-b2a9-319cd291be63","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"建议：如果只有gamma增强但其他判据不满足，可能是"近重费米子"而非真正的重费米子态。"}]},{"type":"paragraph","attrs":{"id":"a28f7ffc-efcd-4f97-91f1-342f41eaa870","textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false}},{"type":"image","attrs":{"id":"b81448e5-da40-45e7-a4d6-800b89577e6c","src":"https://developer.qcloudimg.com/http-sa ve/audit-12559234/8904c4f7ede77397e88f102838719c64.webp","extension":"","align":"center","alt":"","showAlt":false,"href":"","boxShadow":"","width":"","aspectRatio":0,"status":"success","showText":true,"isPercentage":false,"percentage":0,"isHoverDragHandle":false}},{"type":"paragraph","attrs":{"id":"98fc2fe2-868b-4caf-9f77-4f796a4a6c30","textAlign":"center","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"d电子重费米子的发现策略：Hund金属CsFe2As2 Cr掺杂向half-filling推进 -> 轨道选择性关联增强 -> 部分轨道局域化 d轨道Kondo杂化 -> 重费米子态(gamma=270 mJ/mol K^2) -> DFT DMFT理论 实验验证 Doniach相图。"}]},{"type":"paragraph","attrs":{"id":"3a5a94dc-4508-4248-92c8-cd0a5c8f4e30","textAlign":"center","indent":0,"color":null,"background":null,"isHoverDragHandle":false},"content":[{"type":"text","marks":[{"type":"textStyle","attrs":{"color":"","background":""}}],"text":"M. Crispino et al. | Phys. Rev. Lett. 134, 076504 (2025) | 重费米子 Hund金属 轨道选择性Mott转变 DFT DMFT"}]},{"type":"paragraph","attrs":{"id":null,"textAlign":"inherit","indent":0,"color":null,"background":null,"isHoverDragHandle":false}}]}","createTime":1786291708,"ext":{"closeTextLink":0,"comment_ban":0,"description":"","focusRead":0},"fa vNum":0,"html":"","isOriginal":0,"likeNum":0,