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

Journal Article · · Nature Physics
DOI: https://doi.org/10.1038/nphys4295 · OSTI ID:1441312
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  1. Univ. of Cambridge (United Kingdom). Cavendish Lab.
  2. Univ. of Waterloo, ON (Canada). Dept. of Physics and Astronomy
  3. National High Magnetic Field Lab. (MagLab), Tallahassee, FL (United States)
  4. Univ. of Warwick, Coventry (United Kingdom). Dept. of Physics
  5. Univ. of Tokyo, Kashiwa (Japan). Inst. for Solid State Physics
  6. Univ. of Florida, Gainesville, FL (United States). Dept. of Physics
  7. Univ. of Cambridge (United Kingdom). Cavendish Lab.; Univ. of Oxford (United Kingdom). Dept. of Physics
  8. Univ. of Cambridge (United Kingdom). Cavendish Lab.; Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Physics
  9. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  10. Osaka Univ., Toyonaka (Japan). Dept. of Chemistry
  11. National Academy of Sciences of Ukraine, Kiev (Ukraine)

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. In this paper, 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 coefficient, 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. Finally, 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.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); National High Magnetic Field Lab. (MagLab), Tallahassee, FL (United States); Univ. of Cambridge (United Kingdom); Univ. of Warwick, Coventry (United Kingdom); Univ. of Waterloo, ON (Canada); Univ. of Tokyo, Kashiwa (Japan); Osaka Univ., Toyonaka (Japan)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF) (United States); Royal Society (United Kingdom); Engineering and Physical Sciences Research Council (EPSRC) (United Kingdom); European Research Council (ERC); Leverhulme Trust (United Kingdom); Natural Sciences and Engineering Research Council of Canada (NSERC); Ministry of Education, Culture, Sports, Science and Technology (MEXT) (Japan)
Grant/Contract Number:
AC52-06NA25396; SC0002613
OSTI ID:
1441312
Alternate ID(s):
OSTI ID: 1764961
Report Number(s):
LA-UR--17-29404
Journal Information:
Nature Physics, Journal Name: Nature Physics Journal Issue: 2 Vol. 14; ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)Copyright Statement
Country of Publication:
United States
Language:
English

References (93)

Holographic Duality in Condensed Matter Physics book January 2015
Topological Kondo Insulators journal March 2016
Heavy fermions in the Kondo lattice as neutral quasiparticles journal November 1992
Theory of quantum oscillations of magnetization in Kondo insulators journal August 2017
Weak Mott insulators on the triangular lattice: Possibility of a gapless nematic quantum spin liquid journal June 2010
Topological Order: From Long-Range Entangled Quantum Matter to a Unified Origin of Light and Electrons journal January 2013
Quantum oscillations without a Fermi surface and the anomalous de Haas-van Alphen effect text January 2015
Chemical potential asymmetry and quantum oscillations in insulators journal September 2016
Large, high quality single-crystals of the new Topological Kondo Insulator, SmB6 journal October 2013
Properties of the in-gap states in SmB6 journal March 2001
Chemical potential asymmetry and quantum oscillations in insulators text January 2016
Highly Mobile Gapless Excitations in a Two-Dimensional Candidate Quantum Spin Liquid journal June 2010
Gapless spin liquid of an organic triangular compound evidenced by thermodynamic measurements journal April 2011
Quantum oscillations in insulators with neutral Fermi surfaces text January 2017
Pressure-Induced Localization of 4 f Electrons in the Intermediate Valence Compound SmB 6 journal December 2013
Heavy fermions in the Kondo lattice as neutral quasiparticles journal November 1992
Spin and charge dynamics of the ferromagnetic and antiferromagnetic two-dimensional half-filled Kondo lattice model text January 2000
Low-temperature magnetic fluctuations in the Kondo insulator SmB 6 journal April 2014
Fermi surface and cyclotron mass of PrB6 journal October 1985
On the Chemistry and Physical Properties of Flux and Floating Zone Grown SmB6 Single Crystals journal February 2016
Spin and charge dynamics of the ferromagnetic and antiferromagnetic two-dimensional half-filled Kondo lattice model journal March 2001
Skyrme insulators: insulators at the brink of superconductivity text January 2017
Kondo Breakdown and Hybridization Fluctuations in the Kondo-Heisenberg Lattice journal January 2007
Topological Kondo Insulators journal March 2016
Weak magnetism and non-Fermi liquids near heavy-fermion critical points text January 2003
Unusual frequency of quantum oscillations in strongly particle-hole asymmetric insulators journal December 2017
Experimental study of lattice dynamics in LaB6 and YbB6 journal January 1985
Mixed-valence insulators with neutral Fermi surfaces journal May 2018
Skyrme insulators: insulators at the brink of superconductivity text January 2017
Weak magnetism and non-Fermi liquids near heavy-fermion critical points journal January 2004
An effect of Sm vacancies on the hybridization gap in topological Kondo insulator candidate SmB6 journal May 2018
Fractionalized Fermi Liquids journal May 2003
Fractionalized Fermi liquid on the surface of a topological Kondo insulator text January 2015
Electronic Orbital Currents and Polarization in Mott Insulators text January 2007
Quantum oscillations in insulators with neutral Fermi surfaces journal January 2018
Transport anomalies in a simplified model for a heavy-electron quantum critical point journal December 2005
Kondo Breakdown and Quantum Oscillations in SmB 6 journal January 2016
Orbital magnetic field effects in spin liquid with spinon Fermi sea: Possible application to κ − ( ET ) 2 Cu 2 ( C N ) 3 journal April 2006
Excitons in topological Kondo insulators: Theory of thermodynamic and transport anomalies in SmB 6 journal March 2017
Quasiparticle and thermodynamic mass in the heavy-fermion system CeB 6 journal October 1993
Quantum critical phenomena in undoped heavy-fermion metals journal November 1996
Unconventional Fermi surface in an insulating state text January 2015
Thermal conductivity of R B 6 ( R = C e , P r , N d , S m , G d ) single crystals journal August 1996
Thermodynamic properties of a spin-1/2 spin-liquid state in a κ-type organic salt journal April 2008
High pressure insulator-metal transition in SmB6 journal April 1994
Surface Hall Effect and Nonlocal Transport in SmB6: Evidence for Surface Conduction journal November 2013
Global Phase Diagram and Momentum Distribution of Single-Particle Excitations in Kondo insulators text January 2015
The Origin of Anomalous Low-Temperature Downturns in the Thermal Conductivity of Cuprates text January 2006
Excitons in topological Kondo insulators: Theory of thermodynamic and transport anomalies in SmB$_{6}$ text January 2017
Bulk Fermi Surface of Charge-Neutral Excitations in SmB 6 or Not: A Heat-Transport Study journal June 2016
Thermal-Transport Studies on Two-Dimensional Quantum Spin Liquids journal October 2011
Interaction Driven Subgap Spin Exciton in the Kondo Insulator SmB 6 journal January 2015
The birth of topological insulators journal March 2010
Charge Friedel oscillations in a Mott insulator text January 2010
Thermal-transport studies of Two-dimensional Quantum Spin Liquids text January 2011
Quantum Oscillation in Narrow-Gap Topological Insulators journal January 2016
Charge Friedel oscillations in a Mott insulator journal July 2011
de Haas-van Alphen Effect and Fermi Surface of LaB 6 journal January 1977
Two-dimensional Fermi surfaces in Kondo insulator SmB 6 journal December 2014
Skyrme Insulators: Insulators at the Brink of Superconductivity journal August 2017
Quantum oscillations from inside the Fermi sea journal February 2017
Heat Capacity of α -Manganese from 0.2 to 0.4°K journal September 1968
Magnetic Oscillations in Metals book October 2011
Fractionalized Fermi liquid on the surface of a topological Kondo insulator journal March 2016
Unconventional Fermi surface in an insulating state journal July 2015
The role of short-range magnetic correlations in the gap opening of topological Kondo insulators journal July 2017
Breaking the log-jam in many-body physics: Fermi surfaces without Fermi liquids journal January 1992
Mixed-valence insulators with neutral Fermi surfaces journal May 2018
Fermi Surface and Cyclotron Mass of CeB 6 journal October 1989
Electronic orbital currents and polarization in Mott insulators journal July 2008
Pressure-induced Fermi-liquid behavior in the Kondo insulator SmB 6 : Possible transition through a quantum critical point journal May 2003
Quantum Oscillations without a Fermi Surface and the Anomalous de Haas–van Alphen Effect journal September 2015
High-Pressure Ground State of SmB 6 : Electronic Conduction and Long Range Magnetic Order journal April 2005
Are Kondo insulators gapless? journal May 1993
Specific heat of SmB6 at very low temperatures journal May 2006
U(1) Gauge Theory of the Hubbard Model: Spin Liquid States and Possible Application to κ − ( BEDT − TTF ) 2 Cu 2 ( CN ) 3 journal July 2005
Origin of anomalous low-temperature downturns in the thermal conductivity of cuprates journal January 2005
Quantum oscillations without a Fermi surface and the anomalous de Haas-van Alphen effect text January 2015
Electronic Structure of Mixed Valent Systems journal January 2004
Spin and charge dynamics of the ferromagnetic and antiferromagnetic two-dimensional half-filled Kondo lattice model text January 2000
Transport properties of a spinon Fermi surface coupled to a U(1) gauge field journal December 2007
Low-temperature thermal expansion of SmB 6 : Evidence for a single energy scale in the thermodynamics of Kondo insulators journal June 1994
Theory of Thermal Hall Effect in Quantum Magnets text January 2009
Specific heat measurements of YbB12 and YbxLu1−xB12 journal December 1988
Theory of the Thermal Hall Effect in Quantum Magnets journal February 2010
New interpretation of the de Haas-van Alphen signals of LaB6 journal May 1988
Anomalous three-dimensional bulk ac conduction within the Kondo gap of SmB 6 single crystals journal October 2016
Low-temperature surface conduction in the Kondo insulator SmB 6 journal November 2013
Transport Properties of a spinon Fermi surface coupled to a U(1) gauge field text January 2007
Topological Kondo Insulators journal March 2010
High-field suppression of in-gap states in the Kondo insulator Sm B 6 journal February 2007
Transport anomalies in a simplified model for a heavy electron quantum critical point text January 2005
Nonmagnetic 4 f Shell in the High-Pressure Phase of SmS journal August 1971

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Fermi surface, possible unconventional fermions, and unusually robust resistive critical fields in the chiral-structured superconductor AuBe text January 2018
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Quantum Oscillation from In-Gap States and a Non-Hermitian Landau Level Problem journal July 2018
de Haas-van Alphen effect of correlated Dirac states in kagome metal Fe3Sn2 journal October 2019
Raman spectroscopic evidence of impurity‐induced structural distortion in SmB 6 journal July 2019
Anomalous Conductance Oscillations in the Hybridization Gap of InAs / GaSb Quantum Wells journal September 2019
Quantum oscillations in insulators with neutral Fermi surfaces journal January 2018
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Field-dependent heat transport in the Kondo insulator SmB 6 : Phonons scattered by magnetic impurities journal June 2018
Mixed-valence insulators with neutral Fermi surfaces journal May 2018
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Quantum oscillations in strongly correlated topological Kondo insulators journal August 2019
Quantum Oscillation from In-gap States and non-Hermitian Landau Level Problem text January 2018
Investigation of high-temperature bulk transport characteristics and skew scattering in samarium hexaboride preprint January 2019
Finite temperature physics of 1D topological Kondo insulator: Stable Haldane phase, emergent energy scale and beyond journal October 2018