Document Type

Article

Publication Date

6-27-2014

Journal or Book Title

Physical Review B

Volume

89

First Page

224517

DOI

10.1103/PhysRevB.89.224517

Abstract

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|T=const versus x at x∼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 ∼75 K. Thermoelectric power also shows a change in the x∼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.

Comments

This article is from Physical Review B 89 (2014): 224517, doi:10.1103/PhysRevB.89.224517. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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