Fermi Surface and Mass Renormalization in the Iron-Based Superconductor YFe_{2}Ge_{2}.
Fermi Surface and Mass Renormalization in the Iron-Based Superconductor YFe_{2}Ge_{2}.
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DOI：
10.1103/physrevlett.129.046402
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发表时间：
2021-04
影响因子：
8.6
通讯作者：
J. Baglo;Jiasheng Chen;Keiron Murphy;Roos Leenen;A. McCollam;M. Sutherland;F. Grosche
中科院分区：
文献类型：
--
作者：
J. Baglo;Jiasheng Chen;Keiron Murphy;Roos Leenen;A. McCollam;M. Sutherland;F. Grosche
相互作用增强载流子质量是铁基超导体现象学的核心。在新的非常规超导体YFe2Ge2}中的量子振荡测量解决了能带结构计算中预期的所有4个费米面口袋，预测了布里渊区拐角处有一个电子口袋和包围布里渊区顶部和底部中心的3个空穴口袋。载流子质量高达裸电子质量的20倍，是所有铁基材料中观察到的最高载流子质量之一，说明了增强型热容索末菲系数≃100MJ/molK^{2}。质量重整化在整个倒易空间中是一致的，这表明主要是局部关联，就像洪德的金属场景一样。
Interaction-enhanced carrier masses are central to the phenomenology of iron-based superconductors. Quantum oscillation measurements in the new unconventional superconductor YFe_{2}Ge_{2} resolve all four Fermi surface pockets expected from band structure calculations, which predict an electron pocket in the Brillouin zone corner and three hole pockets enveloping the centers of the top and bottom of the Brillouin zone. Carrier masses reach up to 20 times the bare electron mass and are among the highest ever observed in any iron-based material, accounting for the enhanced heat capacity Sommerfeld coefficient ≃100 mJ/mol K^{2}. Mass renormalization is uniform across reciprocal space, suggesting predominantly local correlations, as in the Hund's metal scenario.