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Changes of Fermi surface topology due to the rhombohedral distortion in SnTe

Christopher D. O'Neill, Oliver J. Clark, Harry D. J. Keen, Federico Mazzola, Igor Marković, Dmitry A. Sokolov, Andreas Malekos, Phil D. C. King, Andreas Hermann, and Andrew D. Huxley
Phys. Rev. B 102, 155132 – Published 21 October 2020

Abstract

Stoichiometric SnTe is theoretically a small gap semiconductor that undergoes a ferroelectric distortion on cooling. In reality however, crystals are always nonstoichiometric and metallic; the ferroelectric transition is therefore, more accurately described as a polar structural transition. Here, we study the Fermi surface using quantum oscillations as a function of pressure. We find the oscillation spectrum changes at high pressure due to the suppression of the polar transition and less than 10 kbars is sufficient to stabilize the undistorted cubic lattice, this is accompanied by a large decrease in the Hall and electrical resistivities. Combined with our density functional theory calculations and angle-resolved photoemission spectroscopy measurements, this suggests the Fermi surface L pockets have lower mobility than the tubular Fermi surfaces that connect them. Additionally, we find the unusual phenomenon of a linear magnetoresistance that exists irrespective of the distortion that we attribute to regions of the Fermi surface with high curvature.

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  • Received 3 July 2020
  • Accepted 29 September 2020

DOI:https://doi.org/10.1103/PhysRevB.102.155132

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Christopher D. O'Neill1,*, Oliver J. Clark2, Harry D. J. Keen1, Federico Mazzola2, Igor Marković2,3, Dmitry A. Sokolov3, Andreas Malekos1, Phil D. C. King2, Andreas Hermann1, and Andrew D. Huxley1

  • 1Centre for Science at Extreme Conditions and SUPA, School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
  • 2School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, United Kingdom
  • 3Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany

  • *chris.oneill@ed.ac.uk

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Vol. 102, Iss. 15 — 15 October 2020

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