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Unconventional Fermi surface in an insulating state
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Tan, B. S., Hsu, Y.- T., Zeng, B., Ciomaga Hatnean, Monica, Harrison, N., Zhu, Z., Hartstein, M., Kiourlappou, M., Srivastava, A., Johannes, M. D., Murphy, T. P., Park, J.- H., Balicas, L., Lonzarich, G. G., Balakrishnan, Geetha and Sebastian, S. E. (2015) Unconventional Fermi surface in an insulating state. Science, 349 (6245). pp. 287-290. doi:10.1126/science.aaa7974 ISSN 0036-8075.
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Official URL: http://dx.doi.org/10.1126/science.aaa7974
Abstract
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 behaviour.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Library of Congress Subject Headings (LCSH): | Fermi surfaces, Fermions, Semiconductors | ||||||
| Journal or Publication Title: | Science | ||||||
| Publisher: | American Association for the Advancement of Science | ||||||
| ISSN: | 0036-8075 | ||||||
| Official Date: | 17 July 2015 | ||||||
| Dates: |
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| Volume: | 349 | ||||||
| Number: | 6245 | ||||||
| Page Range: | pp. 287-290 | ||||||
| DOI: | 10.1126/science.aaa7974 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Copyright Holders: | American Association for the Advancement of Science | ||||||
| Date of first compliant deposit: | 26 April 2017 | ||||||
| Date of first compliant Open Access: | 2 May 2017 | ||||||
| Funder: | Royal Society (Great Britain), Winton Programme for the Physics of Sustainability, European Research Council (ERC), Seventh Framework Programme (European Commission) (FP7), United States. Department of Energy. Office of Basic Energy Sciences (OBES), Engineering and Physical Sciences Research Council (EPSRC), United States. Office of Naval Research, National Science Foundation (U.S.) (NSF), Florida. Department of State | ||||||
| Grant number: | FP/2007-2013)/ERC Grant Agreement 337425 (FP7), DE-SC0002613, Materials Science and Engineering “Science of 100 Tesla” programme (OBES), EP/L014963/1, EP/K012894/1 (EPSRC), Cooperative Agreement DMR-1157490 (NSF) |
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