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    Compensated Semimetal LaSb with Unsaturated Magnetoresistance

    L.-K. Zeng1, R. Lou2, D.-S. Wu1, Q. N. Xu1, P.-J. Guo2, L.-Y. Kong1, Y.-G. Zhong1, J.-Z. Ma1, B.-B. Fu1 et al.

    P. Richard1,3, P. Wang1, G. T. Liu1, L. Lu1,3, Y.-B. Huang4, C. Fang1, S.-S. Sun2, Q. Wang2, L. Wang1, Y.-G. Shi1, H. M. Weng1,3, H.-C. Lei2, K. Liu2, S.-C. Wang2,*, T. Qian1,3,†, J.-L. Luo1,3,‡, and H. Ding1,3

    • 1Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
    • 2Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
    • 3Collaborative Innovation Center of Quantum Matter, Beijing, China
    • 4Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China

    • *scw@ruc.edu.cn
    • †tqian@iphy.ac.cn
    • ‡jlluo@iphy.ac.cn
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    Phys. Rev. Lett. 117, 127204 – Published 16 September, 2016

    DOI: https://doi.org/10.1103/PhysRevLett.117.127204

    Abstract

    By combining angle-resolved photoemission spectroscopy and quantum oscillation measurements, we performed a comprehensive investigation on the electronic structure of LaSb, which exhibits near-quadratic extremely large magnetoresistance (XMR) without any sign of saturation at magnetic fields as high as 40 T. We clearly resolve one spherical and one intersecting-ellipsoidal hole Fermi surfaces (FSs) at the Brillouin zone (BZ) center Γ and one ellipsoidal electron FS at the BZ boundary X. The hole and electron carriers calculated from the enclosed FS volumes are perfectly compensated, and the carrier compensation is unaffected by temperature. We further reveal that LaSb is topologically trivial but shares many similarities with the Weyl semimetal TaAs family in the bulk electronic structure. Based on these results, we have examined the mechanisms that have been proposed so far to explain the near-quadratic XMR in semimetals.

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    Phys. Rev. Lett. 117, 127204– Published 16 September, 2016
    • Received 27 April 2016

    © 2016 American Physical Society

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