（Ba $_{1-x}$ K $_x$）Fe $_2$ As $_2$（0.44 $\leq x \leq$ 1）中费米面重构的热电功率测量
Fermi surface reconstruction in (Ba$_{1-x}$K$_x$)Fe$_2$As$_2$ (0.44 $\leq x \leq$ 1) probed by thermoelectric power measurements
摘要：
本文报道了（BaPDMATHABMM K $_x$）FePDMATHABMO As $_2$（0.44 $\leq x \leq$ 1）单晶的面内热电势测量结果。我们观察到S $|_{T=const}$与x在x ~ 0.55处的最小值，该最小值可以与费米表面的拓扑结构的变化相关联，Lifshitz转变，与穿过费米能级的M点中心处的电子袋相关。这一特征在~ 75 K以下可清楚地观察到。热电功率还显示出在x ~ 0.8 - 0.9范围内的变化，其中热电功率的最大值塌陷到平台中。这种Lifshitz转变最有可能与费米表面的重建有关，费米表面与ARPES测量观察到的M点处的空穴转变为四个叶片相关。
英文摘要：
We report in-plane thermoelectric power measurements on single crystals of (Ba$_{1-x}$K$_x$)Fe$_2$As$_2$ (0.44 $\leq x \leq$ 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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
