Exploration of novel quantum phases by angle resolved NMR measurements under hugh pressure

我们开发了一种新型的核磁共振实验用对顶压力池，能产生超过10gpa的压力。该电池具有以下优点：1.使用寿命长。采用氩气（低温下以液体形式引入）作为压力介质，可获得高度均匀的压力。2. 利用铁砧内部引入的光纤测量放置在样品空间中的红宝石的荧光，从而可以对压力进行现场校准。3. 整个电池可以在超导磁体中旋转，允许晶体沿外部磁场任意排列。通过使用这种压力电池，我们发现了铁基材料SrFe2As2中反铁磁性和超导性共存的新有序相。

We have developed a new type of opposed-anvil pressure cell for nuclear magnetic resonance experiments capable of producing more than 10 GPa. This cell has the following advantages: 1. Highly homogeneous pressure can be obtained by using Ar (introduced as liquid at a low temperature) as pressure medium. 2. Measurements of fluorescence from ruby placed in the sample space by using optical fiber introduced inside the anvil allows in-situ calibration of the pressure. 3. The whole cell can be rotated in the superconeducting magnet allowing arbitrary alignment of the crystal along the external magnetic field. By using this pressure cell we discovered new ordered phases such as coexistence of the antiferromagnetism and superconductivity in the iron based material SrFe2As2.