skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

SmB6 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 EA 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. EA 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:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1369188
Alternate Identifier(s):
OSTI ID: 1363837
Report Number(s):
LA-UR-16-28420
Journal ID: ISSN 2469-9950; TRN: US1702756
Grant/Contract Number:  
AC52-06NA25396
Resource 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)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; High Magnetic Field Science

Citation Formats

Wolgast, S., Jaime, Marcelo, Balakirev, Fedor Fedorovich, Eo, Y. S., Sun, K., Kurdak, C., Kim, D.-J., and Fisk, Z. Reduction of the low-temperature bulk gap in samarium hexaboride under high magnetic fields. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.245112.
Wolgast, S., Jaime, Marcelo, Balakirev, Fedor Fedorovich, Eo, Y. S., Sun, K., Kurdak, C., Kim, D.-J., & Fisk, Z. Reduction of the low-temperature bulk gap in samarium hexaboride under high magnetic fields. United States. doi:10.1103/PhysRevB.95.245112.
Wolgast, S., Jaime, Marcelo, Balakirev, Fedor Fedorovich, Eo, Y. S., Sun, K., Kurdak, C., Kim, D.-J., and Fisk, Z. Tue . "Reduction of the low-temperature bulk gap in samarium hexaboride under high magnetic fields". United States. doi:10.1103/PhysRevB.95.245112. https://www.osti.gov/servlets/purl/1369188.
@article{osti_1369188,
title = {Reduction of the low-temperature bulk gap in samarium hexaboride under high magnetic fields},
author = {Wolgast, S. and Jaime, Marcelo and Balakirev, Fedor Fedorovich and Eo, Y. S. and Sun, K. and Kurdak, C. and Kim, D.-J. and Fisk, Z.},
abstractNote = {SmB6 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 EA 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. EA 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.},
doi = {10.1103/PhysRevB.95.245112},
journal = {Physical Review B},
number = 24,
volume = 95,
place = {United States},
year = {2017},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Fractionalized Fermi liquid on the surface of a topological Kondo insulator
journal, March 2016


Quantum Oscillations without a Fermi Surface and the Anomalous de Haas–van Alphen Effect
journal, September 2015


Topological Kondo Insulators
journal, March 2010


Pulsed magnetic field study of the spin gap in intermediate valence compound SmB 6
journal, October 2009


Understanding low-temperature bulk transport in samarium hexaboride without relying on in-gap bulk states
journal, May 2017


Two-dimensional Fermi surfaces in Kondo insulator SmB 6
journal, December 2014


Sm B 6 : Kondo Insulator or Exotic Metal?
journal, February 1995


Ground state formation in intermediate valent SmB6
journal, January 2001


An electron paramagnetic resonance study on Sm 3+ and Yb 3+ in KY 3 F 10 crystals
journal, September 2000


Surface Hall Effect and Nonlocal Transport in SmB6: Evidence for Surface Conduction
journal, November 2013

  • Kim, D. J.; Thomas, S.; Grant, T.
  • Scientific Reports, Vol. 3, Issue 1
  • DOI: 10.1038/srep03150

Field-Induced Metallic State in YbB 12 under High Magnetic Field
journal, November 1988

  • Sugiyama, Kiyohiro; Iga, Fumitoshi; Kasaya, Mitsuo
  • Journal of the Physical Society of Japan, Vol. 57, Issue 11
  • DOI: 10.1143/JPSJ.57.3946

One-dimensional edge state transport in a topological Kondo insulator
journal, November 2015

  • Nakajima, Yasuyuki; Syers, Paul; Wang, Xiangfeng
  • Nature Physics, Vol. 12, Issue 3
  • DOI: 10.1038/nphys3555

Magnetic and Semiconducting Properties of Sm B 6
journal, February 1969


Properties of the in-gap states in SmB6
journal, March 2001


Unconventional Fermi surface in an insulating state
journal, July 2015


Surface electronic structure of the topological Kondo-insulator candidate correlated electron system SmB6
journal, December 2013

  • Neupane, M.; Alidoust, N.; Xu, S-Y.
  • Nature Communications, Vol. 4, Issue 1
  • DOI: 10.1038/ncomms3991

Magnetotransport measurements of the surface states of samarium hexaboride using Corbino structures
journal, September 2015


Correlated Topological Insulators with Mixed Valence
journal, February 2013


Weak antilocalization and linear magnetoresistance in the surface state of SmB 6
journal, November 2016


Tuning Bulk and Surface Conduction in the Proposed Topological Kondo Insulator SmB 6
journal, March 2015


SmB 6 : A Promising Candidate for a Topological Insulator
journal, December 2011


Quantum Oscillation in Narrow-Gap Topological Insulators
journal, January 2016


Low-temperature surface conduction in the Kondo insulator SmB 6
journal, November 2013


Kondo Breakdown and Quantum Oscillations in SmB 6
journal, January 2016


Photoionization hole burning and nonlinear Zeeman effect in CaF_2:Sm^2+
journal, January 1984


Energy gap of intermediate-valent SmB 6 studied by point-contact spectroscopy
journal, August 2001


Low-energy electrodynamics of SmB 6
journal, January 1999


Momentum-dependent hybridization gap and dispersive in-gap state of the Kondo semiconductor SmB 6
journal, August 2012


Chemical potential asymmetry and quantum oscillations in insulators
journal, September 2016


Direct observation of the spin texture in SmB6 as evidence of the topological Kondo insulator
journal, July 2014

  • Xu, N.; Biswas, P. K.; Dil, J. H.
  • Nature Communications, Vol. 5, Issue 1
  • DOI: 10.1038/ncomms5566

Polarized laser excitation, electron paramagnetic resonance, and crystal-field analyses of Sm 3 + -doped LiYF 4
journal, August 1999


Hybridization, Inter-Ion Correlation, and Surface States in the Kondo Insulator SmB 6
journal, February 2013


Ultrahigh-resolution and angle-resolved photoemission study of SmB6
journal, June 2002


Observation of possible topological in-gap surface states in the Kondo insulator SmB6 by photoemission
journal, December 2013

  • Jiang, J.; Li, S.; Zhang, T.
  • Nature Communications, Vol. 4, Issue 1
  • DOI: 10.1038/ncomms4010

Large low-temperature Hall effect and resistivity in mixed-valent Sm B 6
journal, December 1979