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High-temperature superconductivity in sulfur hydride evidenced by alternating-current magnetic susceptibility
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, China.ORCID-id: 0000-0003-0462-6206
Vise andre og tillknytning
2019 (engelsk)Inngår i: National Science Review, ISSN 2095-5138, Vol. 6, nr 4, s. 713-718Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
Oxford University Press, 2019. Vol. 6, nr 4, s. 713-718
Emneord [en]
high pressure, hydrides, superconductivity, Meissner effect
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-166418DOI: 10.1093/nsr/nwz061ISI: 000489296400019Scopus ID: 2-s2.0-85070102200OAI: oai:DiVA.org:umu-166418DiVA, id: diva2:1379245
Tilgjengelig fra: 2019-12-16 Laget: 2019-12-16 Sist oppdatert: 2019-12-16bibliografisk kontrollert

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