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Title: Reduction of the low-temperature bulk gap in samarium hexaboride under high magnetic fields

SmB 6 exhibits a small (15–20 meV) band gap at low temperatures due to hybridized d and f electrons, a tiny (3 meV) transport activation energy E A above 4 K, and surface states accessible to transport below 2 K. We study its magnetoresistance in 60-T pulsed fields between 1.5 and 4 K. The response of the nearly T independent surface states (which show no Shubnikov–de Haas oscillations) is distinct from that of the activated bulk. E A shrinks by 50% under fields up to 60 T. Data up to 93 T suggest that this trend continues beyond 100 T, in contrast to previous explanations. It rules out emerging theories to explain observed exotic magnetic quantum oscillations.
Authors:
 [1] ; ORCiD logo [2] ;  [2] ;  [1] ;  [1] ;  [1] ;  [3] ;  [3]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Physics
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
Publication Date:
Report Number(s):
LA-UR-16-28420
Journal ID: ISSN 2469-9950; TRN: US1702756
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 24; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
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)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; High Magnetic Field Science
OSTI Identifier:
1369188
Alternate Identifier(s):
OSTI ID: 1363837