Development of high pressure cell for magnetic measurements under high pressure and its application for the study on uranium ferromagnets

Tateiwa, Naoyuki   ; Haga, Yoshinori   ; Matsuda, Tatsuma; Fisk, Z.

So far, there have been reported various kinds of high pressure cell for magnetic measurements in the SQUID magnetometer such as the piston-cylinder, the diamond anvil and the indenter cells. We have opposed a miniature ceramic anvil high pressure cell for magnetic measurement in the magnetometer. In this presentation, we shows experimental procedure to attain higher pressures than 10 GPa and experimental data on the rare earth YbCuSi and uranium ferromagnet UGe. YbCuSi is a paramagnetic compound at ambient pressure and becomes a ferromagnetic one above 8 GPa revealed by the ac magnetic susceptibility measurement. We confirm the strong uniaxial ferromagnetic state. Also, we comment on the strong correlation between the maximum in the magnetic susceptibility and the meta magnetic transition observed in the paramagnetic and high pressure phase in UGe.