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Novel Superconducting Materials

Editor-in-Chief: Bianconi, Antonio

Ed. by Awana, V.P.S.

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2299-3193
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High temperature superconductivity in sulfur hydride under ultrahigh pressure: A complex superconducting phase beyond conventional BCS

Annette Bussmann-Holder / Jürgen Köhler / M.-H. Whangbo / Antonio Bianconi
  • RICMASS, Rome International Center for Materials Science Superstripes, Via dei Sabelli 119A, 00185 Rome, Italy
  • MEPhI, Moscow Engineering Physics Institute, National Research Nuclear University, Solid State and Nanosystems Physics, Kashirskoye sh. 31, Moscow 115409, Russia
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Arndt Simon
Published Online: 2016-05-26 | DOI: https://doi.org/10.1515/nsm-2016-0004

Abstract

The recent report of superconductivity under high pressure at the record transition temperature of Tc =203 K in pressurized H2S has been identified as conventional in view of the observation of an isotope effect upon deuteration. Here it is demonstrated that conventional theories of superconductivity in the sense of BCS or Eliashberg formalisms cannot account for the pressure dependence of the isotope coefficient. The only way out of the dilemma is a multi-band approach of superconductivity where already small interband coupling suffices to achieve the high values of Tc together with the anomalous pressure dependent isotope coefficient. In addition, it is shown that anharmonicity of the hydrogen bonds vanishes under pressure whereas anharmonic phonon modes related to sulfur are still active.

Keywords: multi-gap superconductivity; multiplecondensates; steep and flat bands; high temperature superconductivity; pressurized sulfur hydrides

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About the article

Received: 2016-05-03

Accepted: 2016-05-13

Published Online: 2016-05-26


Citation Information: Novel Superconducting Materials, Volume 2, Issue 1, ISSN (Online) 2299-3193, DOI: https://doi.org/10.1515/nsm-2016-0004.

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©2016 Annette Bussmann-Holder et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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