期刊
SCIENCE
卷 349, 期 6245, 页码 287-290出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaa7974
关键词
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资金
- Royal Society
- Winton Programme for the Physics of Sustainability
- European Research Council (ERC) under the European Union [337425]
- U.S. Department of Energy (DOE)-Basic Energy Sciences (BES) [DE-SC0002613]
- Engineering and Physical Sciences Research Council (EPSRC) [EP/L014963/1]
- DOE Office of Science, BES-Materials Science and Engineering Science of 100 Tesla program
- Office of Naval Research (ONR) through the Naval Research Laboratory's Basic Research Program
- EPSRC [EP/K012894/1]
- NSF [DMR-1157490]
- state of Florida
- Engineering and Physical Sciences Research Council [1492065, EP/K012894/1, EP/L014963/1] Funding Source: researchfish
- EPSRC [EP/K012894/1, EP/L014963/1] Funding Source: UKRI
- U.S. Department of Energy (DOE) [DE-SC0002613] Funding Source: U.S. Department of Energy (DOE)
- European Research Council (ERC) [337425] Funding Source: European Research Council (ERC)
Insulators occur in more than one guise; a recent finding was a class of topological insulators, which host a conducting surface juxtaposed with an insulating bulk. Here, we report the observation of an unusual insulating state with an electrically insulating bulk that simultaneously yields bulk quantum oscillations with characteristics of an unconventional Fermi liquid. We present quantum oscillation measurements of magnetic torque in high-purity single crystals of the Kondo insulator SmB6, which reveal quantum oscillation frequencies characteristic of a large three-dimensional conduction electron Fermi surface similar to the metallic rare earth hexaborides such as PrB6 and LaB6. The quantum oscillation amplitude strongly increases at low temperatures, appearing strikingly at variance with conventional metallic behavior.
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