Fermi surface reconstruction in (Ba1-xKx)Fe2As2 (0.44 ≤ x ≤ 1) probed by thermoelectric power measurements

被引：26

作者：

Hodovanets, Halyna ^{[1
]}

Liu, Yong ^{[2
]}

Jesche, Anton ^{[1
,2
]}

Ran, Sheng ^{[1
,2
]}

Mun, Eun Deok ^{[1
,2
]}

Lograsso, Thomas A. ^{[2
,3
]}

Bud'ko, Sergey L. ^{[1
,2
]}

Canfield, Paul C. ^{[1
,2
]}

机构：

[1] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[2] Ames Lab, Div Mat Sci & Engn, Ames, IA 50011 USA

[3] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 22期

关键词：

ELECTRONIC TOPOLOGICAL TRANSITIONS; SUPERCONDUCTIVITY; BAFE2AS2; STATE; METAL;

D O I：

10.1103/PhysRevB.89.224517

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report in-plane thermoelectric power measurements on single crystals of (Ba1-xKx)Fe2As2 (0.44 <= x <= 1). We observe a minimum in the S vertical bar(T=const) versus x at x similar to 0.55 that can be associated with the change in the topology of the Fermi surface, a Lifshitz transition, related to the electron pockets at the center of M point crossing the Fermi level. This feature is clearly observable below similar to 75 K. Thermoelectric power also shows a change in the x similar to 0.8-0.9 range, where the maximum in the thermoelectric power collapses into a plateau. This Lifshitz transition is most likely related to the reconstruction of the Fermi surface associated with the transformation of the hole pockets at the M point into four blades as observed by ARPES measurements.

引用

页数：6

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