Low-Temperature Thermopower in CoSbS

Qianheng Du (杜乾衡), Milinda Abeykoon, Yu Liu (刘育), G. Kotliar, and C. Petrovic
Phys. Rev. Lett. 123, 076602 – Published 16 August 2019

Abstract

We report on giant thermopower of S=2.5mV/K in CoSbS single crystals: a material that shows strong high-temperature thermoelectric performance when doped with Ni or Se. Changes of low-temperature thermopower induced by a magnetic field point to the mechanism of electronic diffusion of carriers in the heavy valence band. Intrinsic magnetic susceptibility is consistent with the Kondo-insulatorlike accumulation of electronic states around the gap edges. This suggests that giant thermopower stems from temperature-dependent renormalization of the noninteracting bands and buildup of the electronic correlations on cooling.

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  • Received 7 February 2019
  • Revised 20 June 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.076602

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Qianheng Du (杜乾衡)1,2,†, Milinda Abeykoon3, Yu Liu (刘育)1, G. Kotliar1,4, and C. Petrovic1,2,*

  • 1Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 2Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11790, USA
  • 3Photon Science Division, National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 4Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08856, USA

  • *petrovic@bnl.gov
  • qdu@bnl.gov

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Issue

Vol. 123, Iss. 7 — 16 August 2019

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