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Electronic structure of a thermoelectric material: BiCuSO

DOI: 10.1103/PhysRevB.103.245121 DOI Help

Authors: D. Pei (University of Oxford) , Y.-Y. Lv (Nanjing University) , Y. Y. Y. Xia (ShanghaiTech University) , Y. W. Li (University of Oxford; ShanghaiTech University) , J. Y. Liu (University of Oxford) , N. B. M. Schröter (Swiss Light Source) , C. Cacho (Diamond Light Source) , Z. K. Liu (ShanghaiTech University) , L. X. Yang (Tsinghua University; Frontier Science Center for Quantum Information, Beijing) , G. Li (ShanghaiTech University) , Y. B. Chen (Nanjing University) , Y. Chen (University of Oxford; ShanghaiTech University; Tsinghua University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 103

State: Published (Approved)
Published: June 2021
Diamond Proposal Number(s): 20617 , 25135

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 ( Z T ) value in the BiCu C h O ( C h = S , Se ) family.

Journal Keywords: Electronic structure; Thermoelectric systems; Angle-resolved photoemission spectroscopy

Subject Areas: Materials, Physics

Instruments: I05-ARPES

Other Facilities: SIS at Swiss Light Source

Added On: 21/06/2021 09:47

Discipline Tags:

Materials Science Quantum Materials Thermoelectrics Physics Hard condensed matter - structures

Technical Tags:

Spectroscopy Angle Resolved Photoemission Spectroscopy (ARPES)