Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 62: Focus Session: High Temperature Superconductivity in Hydrides
TT 62.3: Hauptvortrag
Donnerstag, 10. März 2016, 10:30–11:00, H20
Crystal Structure of 200 K-Superconducting Phase in Sulfur Hydride System — •Mari Einaga1, Masafumi Sakata1, Takahiro Ishikawa1, Katsuya Shimizu1, Mikhail Eremets2, Alexander Drozdov2, Ivan Troyan2, Naohisa Hirao3, and Yasuo Ohishi3 — 1KYOKUGEN, Graduate School of Engineering Science, Osaka university, Machikaneyamacho 1-3, Toyonaka, Osaka, 560-8531, Japan — 2Max Planck Institut fur Chemie, Hahn-Meitner-Weg 1, 55128 Mainz, Germany — 3JASRI/SPring-8, 1-1-1, Sayo-cho, Sayo-gun, Hyogo 679-5198. Japan
Superconductivity with the critical temperature Tc above 200 K has been recently discovered by compression of H2S (or D2S) under extreme pressure [1]. It was proposed that these materials decompose under high pressure to elemental sulfur and hydride with higher content of hydrogen which is responsible for the high temperature superconductivity. In this study, we have investigated that the crystal structure of the superconducting compressed H2S and D2S by synchrotron x-ray diffraction measurements combined with electrical resistance measurements at room and low temperatures. We found that the superconducting phase is in good agreement with theoretically predicted body-centered cubic structure, and coexists with elemental sulfur, which claims that the formation of 3H2S → 2H3S + S is occured under high pressure [2].
A. P. Drozdov et al., arXiv: 1412.0460 (2014),
A. P. Drozdov et al., Nature 525, 73 (2015)
M. Einaga et al., arXiv: 1509.03156 (2015).