| Project/Area Number |
60460024
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
固体物性
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| Research Institution | Muroran Institute of Technology |
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Principal Investigator |
SHIROTANI Ichimin Muroran Institute of Technology, 工学部, 助教授 (90110692)
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| Co-Investigator(Kenkyū-buntansha) |
FUKUSHIMA Seitaro Muroran Institute of Technology, 工学部, 教授 (40113691)
NAGATA Shoichi Muroran Institute of Technology, 工学部, 助教授 (80155936)
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| Project Period (FY) |
1985 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1986: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Superconductivity / Phase Transition / High Pressure / Black Phosphorus / ダイヤモンドアンビル型高圧発生装置 / リン / 黒リン / 赤リン |
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| Research Abstract |
The pressure-induced superconductivity in black phosphorus was measured along five different paths in a P-T phase diagram. The effect of pressure on the superconductivity transition temperature(Tc) strongly depends on the path in the phase diagram. The Tc of black phosphorus along the path(D) went up to 10.7 K and onset temperature of transition was beyond 13 K at very high pressures. When the red phosphorus as a starting material was pressurized at 4.2 K along the path(D), the Tc steeply increased with increasing pressure; it raised up to 13 K and onset temperature of transition reached 18 K at 30 GPa. This is the highest temperature in elements.
Pressure-induced phase transitions have also studied by X-ray study with synchrotron radiation at liquid nitrogen temperature. The pressure of the transition at 77 K was higher than that at room temperature. Two or three phases coexisted in wide pressure range 6-14 GPa at 77 K. These results suggest that there must be inhomogeneous state in simple cubic phase at liquid helium temperature and the inhomogeneity is closely related to the anomalous superconductivity.
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