Orbital mismatch boosting nematic instability in iron-based superconductors

被引：27
|
作者：
Fanfarillo, Laura [1 ,2 ]
Benfatto, Lara [3 ,4 ]
Valenzuela, Belen [5 ]
机构：
[1] CNR, IOM, Via Bonomea 265, I-34136 Trieste, Italy
[2] Int Sch Adv Studies SISSA, Via Bonomea 265, I-34136 Trieste, Italy
[3] Sapienza Univ Rome, ISC CNR, Ple A Moro 5, I-00185 Rome, Italy
[4] Sapienza Univ Rome, Dept Phys, Ple A Moro 5, I-00185 Rome, Italy
[5] CSIC, ICMM, E-28049 Madrid, Spain
来源：
PHYSICAL REVIEW B | 2018年 / 97卷 / 12期
关键词：
MAGNETIC ORDER; FESE;
D O I：
10.1103/PhysRevB.97.121109
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We derive the effective action for the collective spin modes in iron-based superconductors. We show that, due to the orbital-selective nature of spin fluctuations, the magnetic and nematic instabilities are controlled by the degrees of orbital nesting between electron and hole pockets. Within a prototypical three-pocket model the hole-electron orbital mismatch is found to boost spin-nematic order. This explains the enhancement of nematic order in FeSe as compared to 122 compounds, and its suppression under pressure, where the emergence of the second hole pocket compensates the orbital mismatch of the three-pocket configuration.
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收藏
页数：5
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