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Title: An effect of Sm vacancies on the hybridization gap in topological Kondo insulator candidate SmB 6

A necessary element for the predicted topological state in Kondo insulator SmB 6 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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  1. Johns Hopkins Univ., Baltimore, MD (United States)
  2. Univ. of California, Irvine, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of California, Irvine, CA (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 0921-4526; TRN: US1800918
Grant/Contract Number:
AC52-06NA25396; FG02-08ER46544
Accepted Manuscript
Journal Name:
Physica. B, Condensed Matter
Additional Journal Information:
Journal Volume: 536; Journal ID: ISSN 0921-4526
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Material Science; Topological insulator; Kondo insulator; Hybridization gap; Raman scattering
OSTI Identifier: