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Weak phonon-mediated pairing in BiS2 superconductor from first principles

Corentin Morice, Ryosuke Akashi, Takashi Koretsune, Siddharth S. Saxena, and Ryotaro Arita
Phys. Rev. B 95, 180505(R) – Published 19 May 2017
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Abstract

Superconductivity in novel bismuth-sulfur superconductors has attracted large research efforts, both experimental and theoretical, but a consensus on the nature of superconductivity in these materials has yet to be reached. Using density functional theory for superconductors, we study the electron-phonon pairing mechanism in LaO0.5F0.5BiS2. We first confirm the presence of a commensurate charge density wave instability, in accordance with previous studies. Using a recently developed integration scheme for the electron-phonon coupling, we found that its strength is much lower than previously calculated, due to improved density of states calculations. We finally conclude that conventional phonon-mediated pairing cannot explain the high superconducting transition temperatures observed in this material.

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  • Received 23 January 2017
  • Revised 29 March 2017

DOI:https://doi.org/10.1103/PhysRevB.95.180505

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Corentin Morice1, Ryosuke Akashi2, Takashi Koretsune3, Siddharth S. Saxena1, and Ryotaro Arita3

  • 1Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
  • 2University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
  • 3Center for Emergent Matter Science, RIKEN, Wako, Saitama 351-0198, Japan

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Issue

Vol. 95, Iss. 18 — 1 May 2017

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