期刊
NATURE PHYSICS
卷 14, 期 2, 页码 166-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS4295
关键词
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资金
- Royal Society
- Winton Programme for the Physics of Sustainability
- EPSRC [EP/P024947/1, EP/K012894/1]
- European Research Council under the European Unions Seventh Framework Programme/ERC [337425]
- Leverhulme Trust
- NSERC of Canada
- DOE-BES [DE-SC0002613]
- Corpus Christi College, Cambridge
- EPSRC
- EPSRC, UK [EP/M028771/1, EP/L014963/1]
- MEXT [15H05883, 15H03682]
- US Department of Energy, Office of Science, BESMSE Science of 100 Tesla program
- National Science Foundation [DMR-1157490]
- State of Florida
- DOE
- [JP16K05447]
- EPSRC [EP/K012894/1, EP/E011802/1, EP/P024947/1, EP/P023290/1, EP/M000524/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1492065, EP/M000524/1] Funding Source: researchfish
- Grants-in-Aid for Scientific Research [15H03682, 16K05447] Funding Source: KAKEN
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 insulato-rmetal 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.
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