Exploration for Exotic Superconductivity and novel electronic state in Some Strongly Correlated Electron Compounds by DC Magnetic Measurements under 10 GPa Class High Pressure

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Characteristic pressure dependences of T_c have been successfully revealed by DC magnetic measurements under high pressure up to 10 GPa for β pyrochlore oxide AOs_2O_6 (A=K, Rb, Cs), iron pnictide superconductor FeSe_x and LiFeAs using miniature diamond anvil cell combined with commercial SQUID magnetometer. It has been also found that the first order transition at T_s=155K for Li_xCoO_2 (0.46≦x≦0.71) strongly correlates with the ordering of Li ions below TF=130K, suggesting the possible charge ordering in CoO_2 layers below T_s=155K.