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

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [2];  [3];  [4];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Peking Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
  3. Hangzhou Normal Univ., Hangzhou (China)
  4. 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.

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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Cited By (21)

Quantum oscillations of electrical resistivity in an insulator journal August 2018
Imaging emergent heavy Dirac fermions of a topological Kondo insulator journal November 2019
Physical properties of Sm x B 6 single crystals journal January 2019
Effects of spin excitons on the surface states of SmB 6 : A photoemission study journal December 2016
Kondo Breakdown and Quantum Oscillations in SmB 6 journal January 2016
Understanding low-temperature bulk transport in samarium hexaboride without relying on in-gap bulk states journal May 2017
Additional energy scale in SmB6 at low-temperature journal December 2016
Giant isotropic Nernst effect in an anisotropic Kondo semimetal text January 2016
Additional energy scale in SmB$_6$ at low temperature text January 2017
Bulk Rotational Symmetry Breaking in Kondo Insulator SmB 6 journal September 2017
Quantum Oscillations of Electrical Resistivity in an Insulator text January 2019
Giant Isotropic Nernst Effect in an Anisotropic Kondo Semimetal journal November 2016
Isosbestic points in doped Sm B 6 as features of universality and property tuning journal September 2017
Topological surface states interacting with bulk excitations in the Kondo insulator SmB 6 revealed via planar tunneling spectroscopy journal May 2016
Spin Fluctuations at the Surface of Strongly Correlated Topological Insulator SmB6 journal December 2019
Consistency between ARPES and STM measurements on SmB 6 journal February 2020
Kondo Breakdown in Topological Kondo Insulators journal April 2015
Pressure-induced exotic states in rare earth hexaborides journal July 2016
Quantum Oscillations in Flux-Grown SmB 6 with Embedded Aluminum journal April 2019
Planar tunneling spectroscopy of the topological Kondo insulator SmB 6 journal May 2017
Bulk Fermi Surface of Charge-Neutral Excitations in SmB 6 or Not: A Heat-Transport Study journal June 2016