Crystal size effects on giant thermopower in CrSb2

Du, Qianheng; Guzman, David; Choi, Sangkook; Petrovic, Cedomir

doi:10.1103/PhysRevB.101.035125

Title: Crystal size effects on giant thermopower in ${CrSb}_{2}$

Journal Article · 15 January 2020 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.101.035125 · OSTI ID:1607980

^[1]; Guzman, David ^[2]; Choi, Sangkook ^[2];

^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Here, we have examined size effect on thermal, transport, and thermodynamic properties of a CrSb 2 single crystal. We demonstrate highly anisotropic quasi-one-dimensional electrical conductivity, quasiballistic phonons, and giant thermopower of -6 mV/K at 15 K. A thermopower peak is suppressed to -1.6 mV/K by changing crystal dimensions and shows linear dependence on the phonon mean-free path. Whereas electronic diffusion thermopower is significant, the bulk of the giant thermopower in CrSb₂ stems from the coupling of the very long mean-free path phonons with the in-gap states.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012704

OSTI ID:: 1607980

Report Number(s):: BNL--213792-2020-JAAM

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 3 Vol. 101; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Crystal size effects on giant thermopower in CrSb 2

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Title: Crystal size effects on giant thermopower in ${CrSb}_{2}$