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

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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.