High-temperature superconductivity in sulfur hydride evidenced by alternating-current magnetic susceptibility. Issue 4 (9th May 2019)

• Record Type: Journal Article
• Authors: Huang, Xiaoli; Wang, Xin; Duan, Defang; Sundqvist, Bertil; Li, Xin; Huang, Yanping; Yu, Hongyu; Li, Fangfei; Zhou, Qiang; Liu, Bingbing; Cui, Tian
• Is Part Of: National science review. Volume 6:Issue 4(2019)
• Page Start: 713
• Page End: 718
• Publication Date: 2019-05-09
• Subjects: high pressure -- hydrides -- superconductivity -- Meissner effect; Science -- Periodicals; 505
• DOI: 10.1093/nsr/nwz061
• Languages: English
• ISSNs: 2095-5138

Abstract

ABSTRACT: The search for high-temperature superconductivity is one of the research frontiers in physics. In the sulfur hydride system, an extremely high T c (∼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 T c reaches 183 K at 149 GPa before decreasing monotonically with increasing pressure. By means of theoretical calculations, we elucidate the variation of T c in the low-pressure region in terms of the changing stoichiometry of sulfur hydride and the further decrease in T c owing to a drop in the electron–phonon interaction parameter λ. This work provides a new insight into clarifying superconducting phenomena and anchoring the superconducting phase diagram in the hydrides.