高压下FeSe超导电性的消失与存活
Disappearance and Survival of Superconductivity in FeSe under High Pressure
摘要：
通过金刚石对顶砧测量直流磁化强度，研究了FeSe在高压下的超导电性。我们成功地观察到，当Ar（甘油）作为传压介质时，在$\sim$ 7 GPa（$\sim$ 5 GPa）以上，由于非超导的正I型\hspace{-1pt} I相的出现，超导电性消失。与此相反，已经发现，当片晶单晶样品的厚度（$t$）减小时，超导性甚至在高于7 GPa的压力下仍然存在。超导性在7 GPa以上的存活率与先前通过使用立方砧装置在流体静压下的观察一致，这表明通过减少$t$来改善压力的流体静压。还推断，邻位I \hspace{-1pt} I相的出现是由于沿[001]方向的单轴应力。
英文摘要：
Superconductivity in FeSe was investigated under high pressure through the measurements of DC magnetization by using a diamond anvil cell. We successfully observed that the disappearance of the superconductivity as a results of the appearance of the non-superconducting ortho I\hspace{-1pt}I phase above $\sim$7 GPa ($\sim$5 GPa), when Ar (glycerin) is used as the pressure transmitting media. Contrary to this, it has been found that the superconductivity even survives under pressure above 7 GPa, when the thickness ($t$) of a platelet-single crystal specimen is reduced. The survival of the superconductivity above 7 GPa is consistent with a previous observation under hydrostatic pressure by using a cubic anvil apparatus, suggesting that the hydrostaticity of the pressure is improved by reducing $t$. It is also inferred that the appearance of the ortho I\hspace{-1pt}I phase is due to uniaxial stress along the [001] direction.
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