Mechanism of the Anomalous Superconductivity in Black Phosphorus

黑磷反常超导机理

• 批准号: 60460024
• 负责人: SHIROTANI Ichimin
• 金额: $ 1.09万
• 依托单位: Muroran Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60460024/
• 关键词: 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

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.

沿着 P-T 相图中的五个不同路径测量了黑磷中压力诱导的超导性。压力对超导转变温度（Tc）的影响很大程度上取决于相图中的路径。黑磷沿路径 (D) 的 Tc 升至 10.7 K，并且在非常高压下转变起始温度超过 13 K。当以红磷为原料沿路径(D)加压至4.2 K时，Tc随着压力的增加而急剧增加；在 30 GPa 下，温度升高至 13 K，转变起始温度达到 18 K。这是元素中的最高温度。压力引起的相变也通过液氮温度下同步加速器辐射的 X 射线研究进行了研究。 77 K 时的转变压力高于室温时的转变压力。 77 K 下，两相或三相在 6-14 GPa 的宽压力范围内共存。这些结果表明，在液氦温度下，简单立方相必然存在不均匀状态，并且这种不均匀性与反常超导性密切相关。

项目成果

Ichimin Shirotani: "Pressure-Induced Phase Transitions and Anomalous Superconductivity of Phosphorus" Kino Zairyo ( Function & Materials ). 7. 56-63 (1987)

Ichimin Shirotani：“磷的压力诱导相变和反常超导性”Kino Zairyo（函数

城谷一民: 機能材料. 7. N 3 56-63 (1987)

白谷和民：功能材料 7. N 3 56-63 (1987)

Hiroshi Iwasaki: Physica. 139&140B. 301-304 (1986)

岩崎宏：物理学。

Akira Yoshihara: Phys.Reu.B. 34. 7467-7470 (1986)

吉原晃：Phys.Reu.B.

Ichimin Shirotani: Phys.Reu.B.

白谷一民：Phys.Reu.B.