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Specific heat and gap structure of a nematic superconductor: Application to FeSe
Physical Review B ( IF 3.2 ) Pub Date : 2021-09-27 , DOI: 10.1103/physrevb.104.094522
Kazi Ranjibul Islam 1 , Jakob Böker 2 , Ilya M. Eremin 2 , Andrey V. Chubukov 1
Affiliation  

We report the results of our in-depth analysis of spectroscopic and thermodynamic properties of a multiorbital metal, like FeSe, which first develops a nematic order and then undergoes a transition into a superconducting state, which coexists with nematicity. We analyze the angular dependence of the gap function and specific heat Cv(T) of such a nematic superconductor. We specifically address three issues: (i) the angular dependence of the gap in light of the competition between the nematicity-induced sd mixture and the orbital transmutation of low-energy excitations in the nematic state, (ii) the effect of nematicity on the magnitude of the jump of the specific heat Cv(T) at Tc and the temperature dependence of Cv(T) below Tc, and (iii) a potential transition at Tc1<Tc from an s+d state to an s+eiηd state that breaks time-reversal symmetry. We consider two scenarios for a nematic order: scenario A, in which this order develops between dxz and dyz orbitals on hole and electron pockets, and scenario B, in which there is an additional component of the nematic order for dxy fermions on the two electron pockets.

中文翻译:

向列超导体的比热和间隙结构:在 FeSe 中的应用

我们报告了对多轨道金属(如 FeSe)的光谱和热力学性质的深入分析结果,该金属首先形成向列有序,然后转变为与向列共存的超导状态。我们分析了间隙函数和比热的角度依赖性Cv()这种向列超导体。我们具体解决了三个问题:(i)考虑到向列性诱导之间的竞争,间隙的角度依赖性-d 混合和向列态低能激发的轨道嬗变,(ii) 向列性对比热跃变幅度的影响 Cv()C 和温度依赖性 Cv() 以下 C,以及 (iii) 在 C1<C 从一个 +d 状态到 +电子一世ηd打破时间反转对称性的状态。我们考虑向列顺序的两种情况:情况 A,其中该顺序在dXzdz 空穴和电子袋上的轨道,以及场景 B,其中有一个额外的向列顺序分量 dX 两个电子袋上的费米子。
更新日期:2021-09-28
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