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Title: Fermi surface reconstruction in (Ba 1-xK x)Fe2As2 (0.44 ≤ x ≤ 1) probed by thermoelectric power measurements

We report in-plane thermoelectric power measurements on single crystals of (Ba 1-xK x)Fe 2As 2(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.
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Publication Date:
OSTI Identifier:
Report Number(s):
IS-J 8374
Journal ID: ISSN 1098-0121; PRBMDO; ArticleNumber: 224517
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 89; Journal Issue: 22
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States