Study of superconductivity in bismuth-alloys by simultaneous measurement of transport and structural properties at high pressures and low temperatures
Project/Area Number |
24740229
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Multi-year Fund |
Research Field |
Condensed matter physics II
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Research Institution | Niigata University |
Principal Investigator |
OHMURA AYAKO 新潟大学, 研究推進機構, 助教 (60425569)
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Project Period (FY) |
2012-04-01 – 2014-03-31
|
Project Status |
Completed (Fiscal Year 2013)
|
Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2012: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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Keywords | 高圧固体物性 / トポロジカル絶縁体 / 超伝導 / 構造解析 / 高圧物性 / 構造相転移 |
Research Abstract |
This study reports pressure-induced superconducting transition in three-dimensional topological insulators investigated by the electrical resistivity measurement and the synchrotron radiation x-ray diffraction under pressure. Cu0.25Bi2(Te1-xSex)3 with concentration of x=0.01 and 0.1, which is the family of topological-superconductor candidate CuyBi2Se3, show the superconducting transitions at temperature of Tc~5K above 10 GPa. In x=0.01, the monoclinic high-pressure phase II appears at 10.9 GPa with increasing pressure. Pressure-induced superconducting transition in x=0.01, therefore, is attributed to the formation of HP-phase II. The highly bulk-insulating topological insulator Bi2Te2Se shows superconductivity at temperature of Tc~3 K above 8 GPa. At this pressure, temperature dependence of resistivity exhibits semiconducting behavior with high resistivity. Thus, in Bi2Te2Se, there is a possibility that the topological insulator phase makes the transition to the superconducting state.
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Report
(3 results)
Research Products
(77 results)
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[Presentation] Pressure-induced superconductivity in non-stoichiometric bismuth telluride Bi35Te652013
Author(s)
M. Einaga, A. Ohmura, F. Ishikawa, A. Nakayama, Yuh Yamada, S. Nakano, A. Matsushita, S. Tanaka, T. Kagayama
Organizer
The 24th International Conference of the International Association for the Advancement of High Pressure Science and Technology
Place of Presentation
Seattle, WA, USA
Related Report
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[Presentation] 古くて新しいYBa2Cu4O8の超伝導2013
Author(s)
中山敦子, 恩田裕介, 山田修平, 藤久裕司, 坂田雅文, 中本有紀, 清水克哉, 中野智志, 大村彩子, 石川文洋, 山田裕
Organizer
第54回高圧討論会
Place of Presentation
朱鷺メッセ 新潟コンベンションセンター
Related Report
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