Journal or Book Title
Physical Review B
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.
American Physical Society
Hodovanets, Halyna; Liu, Yong; Jesche, Anton; Ran, Sheng; Mun, Eun Deok; Lograsso, Thomas A.; Bud'ko, Sergey L.; and Canfield, Paul C., "Fermi surface reconstruction in (Ba1−xKx)Fe2As2 (0.44≤x≤1) probed by thermoelectric power measurements" (2014). Ames Laboratory Publications. 195.