Pressure-induced phase transition and superconductivity in phosphorus.
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概要
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The pressure-induced superconductivity in black phosphorus was measured along five different paths in a P–T phase diagram. The effect of the pressure on the superconducting transition temperature(<I>T</I><SUB>c</SUB>) depends strongly on the path in the P–T phase diagram. The results for several paths were compared with those obtained by Wittig et al. If black phosphorus was pressurized at the temperature of liquid helium, the <I>T</I><SUB>c</SUB> went up to 10.7 K and the onset temperature of transition was beyond 13 K at very high pressures. When red phosphorus was used as the starting material and pressurized at 4.2 K, <I>T</I><SUB>c</SUB> steeply increased with an increase in the pressure; it increased up to 13 K, while the onset temperature of transition reached 18 K at 30 GPa. This is the highest superconducting transition temperature among the elements. Pressure-induced phase transitions have also been studied by the X-ray techniques using synchrotron radiation at the temperature of liquid nitrogen. The pressure of the transition at 77 K was higher than that at room temperature. Two or three phases coexisted in a wide pressure (6–14 GPa) at 77 K.
- 公益社団法人 日本化学会の論文
著者
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SHIROTANI Ichimin
Muroran Institute of Technology
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SHIMOMURA Osamu
National Institute for Research in Inorganic Materials
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Tachikawa Kyoji
National Research Institute For Metals
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Tsuburaya Kazuhiko
Muroran Institute of Technology
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Kawamura Haruki
Himeji Institute of Technology
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Tsuji Kazuhiko
Faculty of Science and Technology, Keio University
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