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Fermi surface in the absence of a Fermi liquid in the Kondo insulator SmB6

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Hartstein, M., Toews, W. H., Hsu, Y.-T., Zeng, B., Chen, X., Ciomaga Hatnean, Monica, Zhang, Q. R., Nakamura, S., Padgett, A. S., Rodway-Gant, G. et al.
(2018) Fermi surface in the absence of a Fermi liquid in the Kondo insulator SmB6. Nature Physics, 14 (2). pp. 166-172. doi:10.1038/NPHYS4295

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Official URL: http://dx.doi.org/10.1038/NPHYS4295

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Abstract

The search for a Fermi surface in the absence of a conventional Fermi liquid has thus far yielded very few potential candidates. Among promising materials are spin-frustrated Mott insulators near the insulator–metal transition, where theory predicts a Fermi surface associated with neutral low-energy excitations. Here we reveal another route to experimentally realize a Fermi surface in the absence of a Fermi liquid by the experimental study of a Kondo insulator SmB6 positioned close to the insulator– metal transition. We present experimental signatures down to low temperatures (<<1 K) associated with a Fermi surface in the bulk, including a sizeable linear specific heat coeffcient, and on the application of a finite magnetic field, bulk magnetic quantum oscillations, finite quantum oscillatory entropy, and substantial enhancement in thermal conductivity well below the charge gap energy scale. Thus, the weight of evidence indicates that despite an extreme instance of Fermi liquid breakdown in Kondo insulating SmB6, a Fermi surface arises from novel itinerant low-energy excitations that couple to magnetic fields, but not weak DC electric fields.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Electric insulators and insulation, Semiconductors, Fermi surfaces, Kondo effect, Metal-insulator transitions
Journal or Publication Title: Nature Physics
Publisher: Nature Publishing Group
ISSN: 1745-2473
Official Date: 2018
Dates:
DateEvent
2018Published
23 October 2017Available
14 September 2017Accepted
23 January 2017Submitted
Date of first compliant deposit: 19 February 2018
Volume: 14
Number: 2
Page Range: pp. 166-172
DOI: 10.1038/NPHYS4295
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: Macmillan Publishers Limited - Springer Nature
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDRoyal Societyhttp://dx.doi.org/10.13039/501100000288
UNSPECIFIEDWinton Programme for the Physics of SustainabilityUNSPECIFIED
EP/P024947/1Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
FP/2007-2013Seventh Framework Programmehttp://dx.doi.org/10.13039/100011102
337425FP7 Ideas: European Research Councilhttp://dx.doi.org/10.13039/100011199
Philip Leverhulme PrizeLeverhulme Trusthttp://dx.doi.org/10.13039/501100000275
UNSPECIFIEDNatural Sciences and Engineering Research Council of Canadahttp://dx.doi.org/10.13039/501100000038
DE-SC0002613Basic Energy Scienceshttp://dx.doi.org/10.13039/100006151
UNSPECIFIEDCorpus Christi College, University of Cambridgehttp://dx.doi.org/10.13039/501100000591
EP/M028771/1Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/L014963/1Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
"J-Physics" (15H05883)Ministry of Education, Culture, Sports, Science and Technologyhttp://dx.doi.org/10.13039/501100001700
KAK-ENHI (15H03685)Ministry of Education, Culture, Sports, Science and Technologyhttp://dx.doi.org/10.13039/501100001700
UNSPECIFIEDU.S. Department of Energyhttp://dx.doi.org/10.13039/100000015
UNSPECIFIEDOffice of Sciencehttp://dx.doi.org/10.13039/100006132
Science of 100 Tesla programBasic Energy Scienceshttp://dx.doi.org/10.13039/100006151
JP16K05447Ministry of Education, Culture, Sports, Science and Technologyhttp://dx.doi.org/10.13039/501100001700
EP/K012894/1Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
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