Study of Pressure Induced Phase Transition of Molecular Crystals

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。

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.