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Title: A highly asymmetric nodal semimetal in bulk SmB 6

Abstract

In this work, we show that novel low temperature properties of bulk SmB 6, including the sudden growth of the de Haas–van Alphen (dHvA) amplitude (and heat capacity) at millikelvin temperatures and a previously unreported linear-in-temperature bulk electrical conductivity at liquid helium temperatures, signal the presence of a highly asymmetric nodal semimetal. We show that a highly asymmetric nodal semimetal is also a predicted property of the Kondo lattice model (with dispersionless f -electron levels) in the presence of Sm vacancies or other defects. Lastly, we show it can result from a topological transformation of the type recently considered by Shen and Fu and eliminates the necessity of a neutral Fermi surface for explaining bulk dHvA oscillations in SmB 6

Authors:
ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
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) (SC-22); USDOE
OSTI Identifier:
1483505
Alternate Identifier(s):
OSTI ID: 1459481; OSTI ID: 1530783
Report Number(s):
LA-UR-18-22517; LA-UR-18-25812
Journal ID: ISSN 0031-9007; 1079-7114 (Electronic)
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 121; Journal Issue: 2; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; High Magnetic Field Science

Citation Formats

Harrison, Neil. A highly asymmetric nodal semimetal in bulk SmB6. United States: N. p., 2018. Web. doi:10.1103/PhysRevLett.121.026602.
Harrison, Neil. A highly asymmetric nodal semimetal in bulk SmB6. United States. doi:10.1103/PhysRevLett.121.026602.
Harrison, Neil. Mon . "A highly asymmetric nodal semimetal in bulk SmB6". United States. doi:10.1103/PhysRevLett.121.026602. https://www.osti.gov/servlets/purl/1483505.
@article{osti_1483505,
title = {A highly asymmetric nodal semimetal in bulk SmB6},
author = {Harrison, Neil},
abstractNote = {In this work, we show that novel low temperature properties of bulk SmB6, including the sudden growth of the de Haas–van Alphen (dHvA) amplitude (and heat capacity) at millikelvin temperatures and a previously unreported linear-in-temperature bulk electrical conductivity at liquid helium temperatures, signal the presence of a highly asymmetric nodal semimetal. We show that a highly asymmetric nodal semimetal is also a predicted property of the Kondo lattice model (with dispersionless f -electron levels) in the presence of Sm vacancies or other defects. Lastly, we show it can result from a topological transformation of the type recently considered by Shen and Fu and eliminates the necessity of a neutral Fermi surface for explaining bulk dHvA oscillations in SmB6},
doi = {10.1103/PhysRevLett.121.026602},
journal = {Physical Review Letters},
number = 2,
volume = 121,
place = {United States},
year = {2018},
month = {7}
}

Journal Article:
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Cited by: 5 works
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Figures / Tables:

FIG. 1 FIG. 1: (a), Temperature-dependent amplitude of the 330 T dHvA frequency in SmB6 (black circles) together with a fit (blue line) to AdHvA(T ) = AcRT,c + AfRT,f , in which RT,c = Xc/ sinhXc and RT,f = Xf/ sinhXf are the thermal damping factors, Xc = 2π 2m$^{∗}_{c}$kBT/$\hbar$eB andmore » Xf = 2π2m$^{∗}_{f}$kBT/$\hbar$eB, showing it to stem from the superposition of conduction electron-like and f -electron-like channels with effective masses m$^{∗}_{c}$ and m$^{∗}_{f}$ , respectively. The inset shows the same fit with a logarithmic T axis. (b) Collapsed curves of the low T region of the bulk conductance of SmB6 inferred from Fig. 2c, after subtracting the surface contribution σsurf from each curve, with a dotted line extending to T = 0 added as a guide to the eye. The inset shows similar collapsed curves from Fig. 2b.« less

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    Works referencing / citing this record:

    Topology and exceptional points of massive Dirac models with generic non-Hermitian perturbations
    journal, June 2019


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