First-principles search for metallic and superconducting phases in compressed solid hydrogen
| Project/Area Number |
15K17707
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | Osaka University |
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Principal Investigator |
Ishikawa Takahiro 大阪大学, 基礎工学研究科, 特任助教(常勤) (40423082)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
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| Keywords | 固体水素 / 水素化合物 / 金属化 / 高温超伝導 / 第一原理計算 / 結晶構造予測 / ポテンシャルエネルギー面トレッキング / 遺伝的アルゴリズム / 超伝導 / 硫黄水素化物 / 結晶構造探索 |
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| Outline of Final Research Achievements |
I theoretically searched for novel metallic and room-temperature superconducting phases in solid hydrogen under high-pressure using potential energy surface trekking. New high-pressure phases have not been discovered yet, whereas a new finding was obtained in the metallic phase from 500 to 600 GPa, in which Cs-IV-type structure takes shuttlewise distortion. In addition, I also investigated hydrogen compounds expected to have a potential for high-temperature superconductivity, using genetic algorithm technique. A novel sulfur-hydrogen compound H5S2 was predicted to be thermodynamically stable phase at around 110 GPa and show the superconducting critical temperature of 50-70 K, reproducing the experimental data. These results suggest that room-temperature superconductivity at pressures accessible by experiments, i.e. less than 360 GPa, is difficult to be obtained in pure solid hydrogen, whereas it is sufficiently expected in hydrogen compounds.
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Report
(3 results)
Research Products
(28 results)
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[Presentation] Crystal structure in sulfur hydride under high pressure2016
Author(s)
M. Einaga, M. Sakata, T. Ishikawa, K. Shimizu, M. I. Eremets, A. P. Drozdov, S. Imada, N. Hirao, and Y. Ohishi
Organizer
The 17th International Conference on High Pressure in Semiconductor Physics (HPSP-17) & Workshop on High-pressure Study on Superconducting (WHS)
Place of Presentation
Sanjo Conference Hall (Bunkyo-ku, Tokyo)
Year and Date
2016-08-07
Related Report
Int'l Joint Research / Invited
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[Presentation] Superconducting H5S2 compound from first-principles2016
Author(s)
T. Ishikawa, A. Nakanishi, K. Shimizu, H. Katayama-Yoshida, T. Oda, and N. Suzuki
Organizer
The 17th International Conference on High Pressure in Semiconductor Physics (HPSP-17) & Workshop on High-pressure Study on Superconducting (WHS)
Place of Presentation
Sanjo Conference Hall (Bunkyo-ku, Tokyo)
Year and Date
2016-08-07
Related Report
Int'l Joint Research
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