Fermi surface reconstruction in (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ (0.44 $\le x\le$ 1) probed by thermoelectric power measurements

Abstract

We report in-plane thermoelectric power measurements on single crystals of (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ (0.44 $\le x\le$ 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 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.

Accepted for publication in Phys. Rev. B

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Cited by in corpus (3)

• Crossover in the magnetic response of single-crystalline Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ and Lifshitz critical point evidenced by Hall effect measurements
• Dirac points of electron energy spectrum, band-contact lines, and electron topological transitions of 3 1/2 kind in three-dimensional metals
• Superconductivity In K- And Na- Doped Bafe2as2: What Can We Learn From Heat Capacity And Pressure Dependence of Tc