2016/10/09 by Xiaoli Huang, Xin Wang, Defang Duan +8 · 2 citations
Chemistry · Earth and Planetary Sciences · Physics and Astronomy · #Advanced Chemical Physics Studies #Ambient pressure #Chemistry #Condensed matter physics #High-pressure geophysics and materials #High-temperature superconductivity #Hydride #Materials science #Meissner effect #Metal #Metallurgy #Phase (matter) #Phase diagram #Physical chemistry #Physics #Rare-earth and actinide compounds #Room-temperature superconductor #Stoichiometry #Sulfur #Superconductivity #Thermodynamics #cond-mat.supr-con
paper · pdf · doi:10.1093/nsr/nwz061
published as National Science Review 6, 713-718 (2019)
arxiv created 2016/10/09 · openalex publication_date 2019/05/08 · arxiv updated 2020/08/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
ABSTRACT 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 parameter λ. This work provides a new insight into clarifying superconducting phenomena and anchoring the superconducting phase diagram in the hydrides.