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

Hartstein, M.; Toews, W. H.; Hsu, Y. -T.; Zeng, B.; Chen, X.; Hatnean, M. Ciomaga; Zhang, Q. R.; Nakamura, S.; Padgett, A. S.; Rodway-Gant, G.; Berk, J.; Kingston, M. K.; Zhang, G. H.; Chan, M. K.; Yamashita, S.; Sakakibara, T.; Takano, Y.; Park, J. -H.; Balicas, L.; Harrison, N.; Shitsevalova, N.; Balakrishnan, G.; Lonzarich, G. G.; Hill, R. W.; Sutherland, M.; Sebastian, Suchitra E.

doi:10.1038/nphys4295

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

Journal Article · 22 October 2017 · Nature Physics

DOI: https://doi.org/10.1038/nphys4295 · OSTI ID:1441312

Hartstein, M. ^[1]; Toews, W. H. ^[2]; Hsu, Y. -T. ^[1]; Zeng, B. ^[3];

^[1]; Hatnean, M. Ciomaga ^[4]; Zhang, Q. R. ^[3]; Nakamura, S. ^[5]; Padgett, A. S. ^[6]; Rodway-Gant, G. ^[7]; Berk, J. ^[1]; Kingston, M. K. ^[1]; Zhang, G. H. ^[8]; Chan, M. K. ^[9]; Yamashita, S. ^[10]; Sakakibara, T. ^[5]; Takano, Y. ^[6]; Park, J. -H. ^[3];

^[3]; Harrison, N. ^[9] more »

Univ. of Cambridge (United Kingdom). Cavendish Lab.
Univ. of Waterloo, ON (Canada). Dept. of Physics and Astronomy
National High Magnetic Field Lab. (MagLab), Tallahassee, FL (United States)
Univ. of Warwick, Coventry (United Kingdom). Dept. of Physics
Univ. of Tokyo, Kashiwa (Japan). Inst. for Solid State Physics
Univ. of Florida, Gainesville, FL (United States). Dept. of Physics
Univ. of Cambridge (United Kingdom). Cavendish Lab.; Univ. of Oxford (United Kingdom). Dept. of Physics
Univ. of Cambridge (United Kingdom). Cavendish Lab.; Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Physics
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Osaka Univ., Toyonaka (Japan). Dept. of Chemistry
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.

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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

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Unconventional thermal metallic state of charge-neutral fermions in an insulator Sato, Y.; Xiang, Z.; Kasahara, Y. Nature Physics, Vol. 15, Issue 9 https://doi.org/10.1038/s41567-019-0552-2	journal	July 2019
Magnetic field-tuned Fermi liquid in a Kondo insulator Kushwaha, Satya K.; Chan, Mun K.; Park, Joonbum Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-13421-w	journal	December 2019
Mixed-valence insulators with neutral Fermi surfaces Chowdhury, Debanjan; Sodemann, Inti; Senthil, T. Nature Communications, Vol. 9, Issue 1 https://doi.org/10.1038/s41467-018-04163-2	journal	May 2018
Observation of highly stable and symmetric lanthanide octa-boron inverse sandwich complexes Li, Wan-Lu; Chen, Teng-Teng; Xing, Deng-Hui Proceedings of the National Academy of Sciences, Vol. 115, Issue 30 https://doi.org/10.1073/pnas.1806476115	journal	July 2018
Fermi surfaces in Kondo insulators Liu, Hsu; Hartstein, Máté; Wallace, Gregory J. Journal of Physics: Condensed Matter, Vol. 30, Issue 16 https://doi.org/10.1088/1361-648x/aaa522	journal	March 2018
Field-dependent heat transport in the Kondo insulator SmB 6 : Phonons scattered by magnetic impurities Boulanger, M-E.; Laliberté, F.; Dion, M. Physical Review B, Vol. 97, Issue 24 https://doi.org/10.1103/physrevb.97.245141	journal	June 2018
Mixed-valence insulators with neutral Fermi surfaces Chowdhury, Debanjan; Sodemann, Inti; Senthil, T. Nature Communications, Vol. 9, Issue 1 https://doi.org/10.1038/s41467-018-04163-2	journal	May 2018
Ground state anomalies in SmB6 Sakhya, Anup Pradhan; Maiti, Kalobaran Scientific Reports, Vol. 10, Issue 1 https://doi.org/10.1038/s41598-020-58172-7	journal	January 2020
Quantum Oscillations in Flux-Grown SmB 6 with Embedded Aluminum Thomas, S. M.; Ding, Xiaxin; Ronning, F. Physical Review Letters, Vol. 122, Issue 16 https://doi.org/10.1103/physrevlett.122.166401	journal	April 2019
Fermi surface, possible unconventional fermions, and unusually robust resistive critical fields in the chiral-structured superconductor AuBe Rebar, Drew J.; Birnbaum, Serena M.; Singleton, John Physical Review B, Vol. 99, Issue 9 https://doi.org/10.1103/physrevb.99.094517	journal	March 2019
Quantum oscillations in strongly correlated topological Kondo insulators Peters, Robert; Yoshida, Tsuneya; Kawakami, Norio Physical Review B, Vol. 100, Issue 8 https://doi.org/10.1103/physrevb.100.085124	journal	August 2019
Quantum Oscillation from In-gap States and non-Hermitian Landau Level Problem Shen, Huitao; Fu, Liang arXiv https://doi.org/10.48550/arxiv.1802.03023	text	January 2018
Investigation of high-temperature bulk transport characteristics and skew scattering in samarium hexaboride Rakoski, Alexa; Eo, Yun Suk; Kurdak, Çağlıyan arXiv https://doi.org/10.48550/arxiv.1907.09436	preprint	January 2019
Finite temperature physics of 1D topological Kondo insulator: Stable Haldane phase, emergent energy scale and beyond Zhong, Yin; Wang, Qin; Liu, Yu Frontiers of Physics, Vol. 14, Issue 2 https://doi.org/10.1007/s11467-018-0868-x	journal	October 2018

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

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