Fermi surface reconstruction in (Ba_1-xK_x)Fe2As2 (0.44 ≤ x ≤ 1) probed by thermoelectric power measurements

Journal Article · Sun Jun 01 00:00:00 EDT 2014 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.89.224517· OSTI ID:1157660

Hodovanets, Halyna; Liu, Yong; Jesche, Anton; Ran, Sheng; Mun, Eun Deok; Lograsso, Thomas A; Bud'ko, Sergey L; Canfield, Paul C

We report in-plane thermoelectric power measurements on single crystals of (Ba_1-xK_x)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.

• Research Organization: Ames Lab., Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-07CH11358
• OSTI ID: 1157660
• Report Number(s): IS-J 8374; PRBMDO; ArticleNumber: 224517
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 89, Issue 22; ISSN 1098-0121
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE