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SPring-8 Seminar (第243回)

副題/演題 Conventional superconductivity at 195 K in hydrogen sulfide at high pressures
開催期間 2015年05月21日 (木) 11時00分から12時00分まで
開催場所 上坪講堂
主催 (公財)高輝度光科学研究センター(JASRI)
形式 レクチャー(講演)
概要

Speaker : Dr. Mikhail I. Eremets

Language : English

Affiliation : Max-Planck Institut fur Chemie, Chemistry and Physics at High Pressures Group

Title : Conventional superconductivity at 195 K in hydrogen sulfide at high pressures

Abstract:
The Bardeen-Cooper-Schrieffer (BCS) theory gives a guide for achieving high Tc: it should be a favorable combination of high frequency phonons, strong coupling between electrons and phonons, and high density of states. These conditions can be fulfilled for metallic hydrogen and covalent hydrogen dominant compounds. We found that sulfur hydride transforms at P~90 GPa to metal and superconductor with the record critical temperature of superconductivity (Tc) of 195 K at P~150 GPa (arXiv:1412.0460). This superconductivity is likely related to higher hydrides HnS (n>2) formed due to the dissociation of H2S. We proved occurrence of superconductivity by the sharp drop of the resistivity at least 50 times lower than the copper resistivity and the decrease of Tc with magnetic field. The isotope shift of Tc in D2S consists with predictions of the BCS theory and indicates a major role of phonons in the superconductivity.

本講演は、JSPS科研費 特別推進研究「メガバールサイエンスの開拓」(26000006)の助成を受けたものです。

担当者 : 大石 泰生
Mail : ohishi@spring8.or.jp
PHS : 3904

問い合わせ先 JASRI 研究調整部 研究業務課 SPring-8セミナー事務局 津田綾女・三村亜佑美
0791-58-0949
0791-58-0830
spring8_seminar@spring8.or.jp
最終変更日 2016-02-08 14:03