Low-Temperature Thermopower in CoSbS

Qianheng Du, Milinda Abeykoon, Yu Liu, G. Kotliar, C. Petrovic

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

We report on giant thermopower of S=2.5 mV/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.

Original languageEnglish (US)
Article number076602
JournalPhysical review letters
Volume123
Issue number7
DOIs
StatePublished - Aug 16 2019

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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