High-temperature superconductivity in sulfur hydride evidenced by alternating-current magnetic susceptibility

• 作者: Bertil Sundqvist Bingbing Liu Defang Duan Fangfei Li Hongyu Yu Qiang Zhou Tian Cui Xiaoli Huang Xin Li Xin Wang Yanping Huang
• 来源期刊: 国家科学评论（英文版）
• 年，卷（期）: 2019,（4）
• 页码范围: 713-718
• 页数: 6页
• 语种: 英文
• DOI: 10.1093/nsr/nwz061

摘要

The search for high-temperature superconductivity is one of the research frontiers in physics. In the sulfur hydride system, an extremely high Tc (～200 K) has been recently developed at pressure. However, the Meissner effect measurement above megabar pressures is still a great challenge. Here, we report the superconductivity identification of sulfur hydride at pressure, employing an in situ alternating-current magnetic susceptibility technique. We determine the superconducting phase diagram,finding that superconductivity suddenly appears at 117 GPa and Tc reaches 183 K at 149 GPa before decreasing monotonically with increasing pressure. By means of theoretical calculations, we elucidate the variation of Tc in the low-pressure region in terms of the changing stoichiometry of sulfur hydride and the further decrease in Tc owing to a drop in the electron–phonon interaction parameterλ. This work provides a new insight into clarifying superconducting phenomena and anchoring the superconducting phase diagram in the hydrides.