An effect of Sm vacancies on the hybridization gap in topological Kondo insulator candidate SmB6

Valentine, Michael E.; Koohpayeh, Seyed; Phelan, W. Adam; McQueen, Tyrel M.; Rosa, Priscila Ferrari Silveira; Fisk, Zachary; Drichko, Natalia

doi:10.1016/j.physb.2017.10.051

Title: An effect of Sm vacancies on the hybridization gap in topological Kondo insulator candidate SmB₆

Journal Article · Wed Nov 22 00:00:00 EST 2017 · Physica. B, Condensed Matter

DOI:https://doi.org/10.1016/j.physb.2017.10.051· OSTI ID:1416316

Valentine, Michael E. ^[1]; Koohpayeh, Seyed ^[1]; Phelan, W. Adam ^[1]; McQueen, Tyrel M. ^[1];

^[2]; Fisk, Zachary ^[3]; Drichko, Natalia ^[1]

Johns Hopkins Univ., Baltimore, MD (United States)
Univ. of California, Irvine, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of California, Irvine, CA (United States)

A necessary element for the predicted topological state in Kondo insulator SmB₆ is the hybridization gap which opens in this compound at low temperatures. Here, in this work, we present a comparative study of the in-gap density of states due to Sm vacancies by Raman scattering spectroscopy and heat capacity for samples where the number of Sm vacancies is equal to or below 1%. We demonstrate that hybridization gap is very sensitive to the presence of Sm vacancies. Lastly, at the amount of vacancies above 1% the gap fills in with impurity states and low temperature heat capacity is enhanced.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC52-06NA25396; FG02-08ER46544

OSTI ID:: 1416316

Report Number(s):: LA-UR-17-30687; TRN: US1800918

Journal Information:: Physica. B, Condensed Matter, Vol. 536; ISSN 0921-4526

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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Fermi surface in the absence of a Fermi liquid in the Kondo insulator SmB6 Hartstein, M.; Toews, W. H.; Hsu, Y. -T. Nature Physics, Vol. 14, Issue 2 https://doi.org/10.1038/nphys4295	journal	October 2017

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Title: An effect of Sm vacancies on the hybridization gap in topological Kondo insulator candidate SmB6

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Title: An effect of Sm vacancies on the hybridization gap in topological Kondo insulator candidate SmB₆