Heavy surface state in a possible topological Kondo insulator: Magnetothermoelectric transport on the (011) plane of SmB6

Luo, Yongkang; Chen, Hua; Dai, Jianhui; Xu, Zhu -an; Thompson, J. D.

doi:10.1103/PhysRevB.91.075130

Title: Heavy surface state in a possible topological Kondo insulator: Magnetothermoelectric transport on the (011) plane of ${SmB}_{6}$

Journal Article · 24 February 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI: https://doi.org/10.1103/PhysRevB.91.075130 · OSTI ID:1227699

Luo, Yongkang ^[1]; Chen, Hua ^[2]; Dai, Jianhui ^[3]; Xu, Zhu -an ^[4]; Thompson, J. D. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Peking Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Hangzhou Normal Univ., Hangzhou (China)
Zhejiang Univ., Hangzhou (China).

Motivated by the high sensitivity to Fermi surface topology and scattering mechanisms in magnetothermoelectric transport, we have measured the thermopower and Nernst effect on the (011) plane of the proposed topological Kondo insulator SmB₆. These experiments, together with electrical resistivity and Hall effect measurements, suggest that the (011) plane also harbors a metallic surface with an effective mass on the order of 10–10² m₀. The surface and bulk conductances are well distinguished in these measurements and are categorized into metallic and nondegenerate semiconducting regimes, respectively. As a result, electronic correlations play an important role in enhancing scattering and also contribute to the heavy surface state.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1227699

Alternate ID(s):: OSTI ID: 1179894

Report Number(s):: LA-UR--14-27821

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 7 Vol. 91; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Heavy surface state in a possible topological Kondo insulator: Magnetothermoelectric transport on the (011) plane of ${SmB}_{6}$