Year: 2021
Type: article
Abstract: We investigate transport properties and the electronic structure of BiCuSO, a thermoelectric material which was predicted as a possible parent compound for unconventional superconductivity. For the $p$-type BiCuSO samples studied in this paper, our transport measurements show metallic behavior down to 2 K, and we observe an increase of saturated magnetic moment around 4 K, which could be due to the reorientation of the magnetic easy axis. Using angle-resolved photoemission spectroscopy measurements, we acquired the comprehensive electronic structure of BiCuSO including the predicted flat band, and by carrying out photon polarization dependent measurements we further investigated the orbital characters of bands near the Fermi level. Compared with its sister compound, BiCuSeO, we find the flat band could be the origin of high figure of merit $(ZT)$ value in the $\mathrm{BiCu}Ch\mathrm{O}$ $(Ch=\mathrm{S}, \mathrm{Se})$ family.
Authors: D. Pei, Y.-Y. Lv, Y. Y. Y. Xia, Y. W. Li, J. Y. Liu, N. B. M. Schröter, C. Cacho, Z. K. Liu, L. X. Yang, G. Li, Y. B. Chen, Y. L. Chen
Institutions: University of Oxford, National Laboratory of Solid State Microstructures, Nanjing University, ShanghaiTech University, Paul Scherrer Institute, Swiss Light Source, Diamond Light Source, State Key Laboratory of Low-Dimensional Quantum Physics, Frontier Science Center for Quantum Information of the Ministry of Education of China, Tsinghua University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3172099478