High pressure study on uranium compound

Tateiwa, Naoyuki   ; Haga, Yoshinori   ; Matsuda, Tatsuma; Yamamoto, Etsuji  ; Matsumoto, Yuji; Fisk, Z.

We will report our studies on uranium compound. In particular, the details of the developments of the high pressure cell for magnetic measurements will be shown. We show some example of the measurements. In semiconducting US, the applying pressure induces a weak ferromagnetic state. On further increase of the pressure above the metal-insulator transition pressure of 4 GPa, the strong ferromagnetic state appears. In uranium superconductor UGe, we analyzed the metamagnetic transition and the maximum in the susceptibility from the view point of the spin fluctuation theory.