Magnetic field and pressure phase diagrams of uranium heavy-fermion compound UZn

Tateiwa, Naoyuki   ; Ikeda, Shugo*; Haga, Yoshinori   ; Matsuda, Tatsuma; Yamamoto, Etsuji  ; Sugiyama, Kiyohiro*; Hagiwara, Masayuki*; Kindo, Koichi*; Onuki, Yoshichika*

We have performed the magnetization measurements in high magnetic fields up to 53 T on single crystals of an uranium heavy fermion compound UZn. In the antiferromagnetic state below the Nel temperature = 9.7 K, a metamagnetic transition is found at 32 T for the field along the [110] direction (-axis). The magnetic phase diagram for the field along the [110] direction is given. We have also carried out high pressure resistivity measurement on UZn using a diamond anvil cell up to 8.7 GPa. The Nel temperature is almost pressure-independent up to 4.7 GPa and starts to increase at the higher pressure region. The pressure dependences of the coefficient of term in the electrical resistivity , an antiferromagnetic gap and a characteristic temperature are discussed.