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Title: Unconventional Fermi surface in an insulating state

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. As a result, the quantum oscillation amplitude strongly increases at low temperatures, appearing strikingly at variance with conventional metallic behavior.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1355814
Alternate Identifier(s):
OSTI ID: 1186042
Report Number(s):
LA-UR-15-24709
Journal ID: ISSN 0036-8075
Grant/Contract Number:  
SC0002613; AC52-06NA25396
Resource Type:
Published Article
Journal Name:
Science
Additional Journal Information:
Journal Name: Science Journal Volume: 349 Journal Issue: 6245; Journal ID: ISSN 0036-8075
Publisher:
American Association for the Advancement of Science (AAAS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; High Magnetic Field Science

Citation Formats

Tan, B. S., Hsu, Y. -. T., Zeng, B., Hatnean, M. C., 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, G., and Sebastian, S. E. Unconventional Fermi surface in an insulating state. United States: N. p., 2015. Web. doi:10.1126/science.aaa7974.
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Tan, B. S., Hsu, Y. -. T., Zeng, B., Hatnean, M. C., 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, G., & Sebastian, S. E. Unconventional Fermi surface in an insulating state. United States. https://doi.org/10.1126/science.aaa7974
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Tan, B. S., Hsu, Y. -. T., Zeng, B., Hatnean, M. C., 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, G., and Sebastian, S. E. Thu . "Unconventional Fermi surface in an insulating state". United States. https://doi.org/10.1126/science.aaa7974.
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@article{osti_1355814,
title = {Unconventional Fermi surface in an insulating state},
author = {Tan, B. S. and Hsu, Y. -. T. and Zeng, B. and Hatnean, M. C. and Harrison, N. and Zhu, Z. and Hartstein, M. and Kiourlappou, M. and Srivastava, A. and Johannes, M. D. and Murphy, T. P. and Park, J. -. H. and Balicas, L. and Lonzarich, G. G. and Balakrishnan, G. and Sebastian, S. E.},
abstractNote = {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. As a result, the quantum oscillation amplitude strongly increases at low temperatures, appearing strikingly at variance with conventional metallic behavior.},
doi = {10.1126/science.aaa7974},
journal = {Science},
number = 6245,
volume = 349,
place = {United States},
year = {Thu Jul 02 00:00:00 EDT 2015},
month = {Thu Jul 02 00:00:00 EDT 2015}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1126/science.aaa7974
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Cited by: 211 works
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Figures / Tables:

Fig. 1 Fig. 1: Quantum oscillations in the magnetic torque in SmB6. (A) Quantum oscillations in magnetic torque are visible against a quadratic background. (Inset) Schematic of the magnetic torque measurement setup using a capacitive cantilever and the notation for angular rotation by angle θ. (B) Resistance as a function of temperaturemore » in zero magnetic field (blue line), and at 45 T (green line) using an unchanged measurement configuration on a SmB6 sample of dimensions 1.1 by 0.3 by 0.1 mm. (Top inset) Measured resistance from 80 mK up to high temperatures, from which the high IRR can be ascertained [a fit to activated electrical conductivity is provided in [23]]. (Bottom inset) Magnetisation of SmB6 at 2.1 K remains linear up to 60 T. (C) Dominant low frequency quantum oscillations can be discerned after background subtraction of a sixth order polynomial. (D) Magnetic torque at the highest measured fields after the subtraction of the low frequency background torque. Quantum oscillations are visible in an intermediate frequency range (between 2,000 and 4,000 T) as well as a high frequency range up to 15,000 T.« less
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