Consistent picture of the octet-nodal gap and its evolution with doping in heavily overdoped Ba1-xKxFe2As2

被引：1

作者：

Yu, Shun-Li ^{[1
,2
,3
]}

Yao, Zi-Jian ^{[1
,2
,3
]}

Li, Jian-Xin ^{[1
,2
,3
]}

机构：

[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

[2] Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China

[3] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2015年 / 27卷 / 50期

基金：

中国国家自然科学基金;

关键词：

KFe2As2; spin fluctuation; pairing symmetry; SUPERCONDUCTOR; KFE2AS2;

D O I：

10.1088/0953-8984/27/50/505701

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We investigate the pairing symmetry in heavily overdoped Ba1-xKxFe2As2 based on the spin-fluctuation mechanism. We propose a Fermi-patch mechanism that is different from the conventional Fermi-surface-nesting picture. The exotic octet nodes of the superconducting gap and the unusual evolution of the gap with doping observed by the recent experiments are well explained in a unified manner. We demonstrate that the scattering of electrons on the Fermi patches is mainly responsible for the incommensurate spin fluctuations and consequently the Fermi-surface-dependent multi-gap structure, since the Fermi level is close to the flat band. In addition, we find that a d-wave pairing state will prevail over the s-wave pairing state around the Lifshitz transition point.

引用

页数：8

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