Low-temperature conducting state in two candidate topological Kondo insulators: SmB6 and Ce3Bi4Pt3

Wakeham, N.; Rosa, P. F.  S.; Wang, Y. Q.; Kang, M.; Fisk, Z.; Ronning, F.; Thompson, J. D.

doi:10.1103/PhysRevB.94.035127

Title: Low-temperature conducting state in two candidate topological Kondo insulators: ${SmB}_{6}$ and ${Ce}_{3} {Bi}_{4} {Pt}_{3}$

Journal Article · 11 July 2016 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.94.035127 · OSTI ID:1414091

Wakeham, N. ^[1]; Rosa, P. F. S. ^[1]; Wang, Y. Q. ^[1]; Kang, M. ^[1]; Fisk, Z. ^[2]; Ronning, F. ^[1]; Thompson, J. D. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of California, Irvine, CA (United States)

We have investigated the low temperature conducting state of two Kondo insulators, SmB₆ and Ce₃Bi₄Pt₃, which have been theoretically predicted to host topological surface states. Through comparison of the speci c heat of as-grown and powdered single crystals of SmB₆, we show that the residual term that is linear in temperature is not dominated by any surface state contribution, but rather is a bulk property. In Ce₃Bi₄Pt₃, we find that the Hall coefficient is independent of sample thickness, which indicates that conduction at low temperatures is dominated by the bulk of the sample, and not by a surface state. The low temperature resistivity of Ce₃Bi₄Pt₃ is found to monotonically decrease with low concentrations of disorder introduced through ion-irradiation. This is in contrast to SmB₆, which is again indicative of the contrasting origins of the low temperature conduction. In SmB₆, we also show that the effect of low concentrations of irradiation damage of the surface with Fe⁺ ions is qualitatively consistent with damage with non-magnetic ions.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1414091

Alternate ID(s):: OSTI ID: 1261700

Report Number(s):: LA--UR-16-22744

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 3 Vol. 94; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Quantum oscillations in insulators with neutral Fermi surfaces Sodemann, Inti; Chowdhury, Debanjan; Senthil, T. Physical Review B, Vol. 97, Issue 4 https://doi.org/10.1103/physrevb.97.045152	journal	January 2018
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Title: Low-temperature conducting state in two candidate topological Kondo insulators: ${SmB}_{6}$ and ${Ce}_{3} {Bi}_{4} {Pt}_{3}$