Study of Pressure Induced Phase Transition of Molecular Crystals

分子晶体压力诱导相变的研究

• 批准号: 05452057
• 负责人: AMAYA Kiichi
• 金额: $ 4.35万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452057/
• 关键词: Molecular Crystal; Pressure Induced Superconductivity; Very Low Temperature and Ultra High Pressure; 極低温超高圧

The purpose of present research is to attain the complex extreme condition of low temperature down to mK and ultra high pressure up to 100GPa and also to study the pressure induced superconductivity of molecular crystals, especially of iodine and bromine.Up to now, We have obatined the following results ;1. Ultra high pressure of 1000Gpa is attained at temperatures down to 30mK.2. pressure induced superconductivity is observed for the first time under the pressure above 90GPa and at temperatures below 1K.3. Temperature-Pressure phase diagram of super-normal transition of iodine is completed.4. Bisides iodine and bromine, we observed the superconductivity of Ca at 70GPa and 0.2K.5. Solidification and optical transparency are now studied for molecular oxygen at high pressures up to 70GPa.

本研究的目的是获得低温至mK和超高压至100GPa的复杂极端条件，并研究分子晶体，特别是碘和溴晶体的压致超导电性。1000Gpa的超高压在温度低至30mK时达到。2.在90GPa以上的压力和1K.3以下的温度下首次观察到压力诱导超导。完成了碘的超常相变的温压相图.除了碘和溴之外，我们还观察到Ca在70GPa和0.2K下的超导电性。目前正在研究分子氧在高达70GPa的高压下的凝固和光学透明性。

项目成果

T.Yamauchi et.al: "Hall Effect of Iodine in High Pressure" J.Phys.Soc.Jpm.63. 3207- (1994)

T.Yamauchi 等人：“高压中碘的霍尔效应”J.Phys.Soc.Jpm.63。

天谷喜一: "極低温,超高圧下の物性測定" 学術月報. 46. 780 (1994)

Kiichi Amaya：“极低温和超高压下物理性能的测量”学术月报 46. 780 (1994)。

K.Shimizu et.al: "Observation of Superconductivity of Iodine" Proc.20th Int'l Conf.Low.Temp.Phys.(1994)

K.Shimizu 等人：“碘超导性的观察”Proc.20th Intl Conf.Low.Temp.Phys.(1994)

M.Ishizuka: "Magnetic Measurements under Ultrahigh Pressure" IEEE Trans.Magn.30. 1048-1051 (1994)

M.Ishizuka：“超高压下的磁测量”IEEE Trans.Magn.30。

K.Shimizu et.al: "Observation of Pressure Induced Superconductivity of Iotime" Physica B. 194-196. 1957-1960 (1994)

K.Shimizu 等人：“Iotime 压力诱导超导性的观察”Physica B. 194-196。