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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.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [2] ;  [3] ;  [1]
  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):
LA-UR-17-30687
Journal ID: ISSN 0921-4526; TRN: US1800918
Grant/Contract Number:
AC52-06NA25396; FG02-08ER46544
Type:
Accepted Manuscript
Journal Name:
Physica. B, Condensed Matter
Additional Journal Information:
Journal Volume: 536; Journal ID: ISSN 0921-4526
Publisher:
Elsevier
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
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Material Science; Topological insulator; Kondo insulator; Hybridization gap; Raman scattering
OSTI Identifier:
1416316

Valentine, Michael E., Koohpayeh, Seyed, Phelan, W. Adam, McQueen, Tyrel M., Rosa, Priscila Ferrari Silveira, Fisk, Zachary, and Drichko, Natalia. An effect of Sm vacancies on the hybridization gap in topological Kondo insulator candidate SmB6. United States: N. p., Web. doi:10.1016/j.physb.2017.10.051.
Valentine, Michael E., Koohpayeh, Seyed, Phelan, W. Adam, McQueen, Tyrel M., Rosa, Priscila Ferrari Silveira, Fisk, Zachary, & Drichko, Natalia. An effect of Sm vacancies on the hybridization gap in topological Kondo insulator candidate SmB6. United States. doi:10.1016/j.physb.2017.10.051.
Valentine, Michael E., Koohpayeh, Seyed, Phelan, W. Adam, McQueen, Tyrel M., Rosa, Priscila Ferrari Silveira, Fisk, Zachary, and Drichko, Natalia. 2017. "An effect of Sm vacancies on the hybridization gap in topological Kondo insulator candidate SmB6". United States. doi:10.1016/j.physb.2017.10.051.
@article{osti_1416316,
title = {An effect of Sm vacancies on the hybridization gap in topological Kondo insulator candidate SmB6},
author = {Valentine, Michael E. and Koohpayeh, Seyed and Phelan, W. Adam and McQueen, Tyrel M. and Rosa, Priscila Ferrari Silveira and Fisk, Zachary and Drichko, Natalia},
abstractNote = {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.},
doi = {10.1016/j.physb.2017.10.051},
journal = {Physica. B, Condensed Matter},
number = ,
volume = 536,
place = {United States},
year = {2017},
month = {11}
}