High pressure study on uranium heavy fermion compounds with antiferromagnetic ground state

Tateiwa, Naoyuki   ; Ikeda, Shugo*; Haga, Yoshinori   ; Matsuda, Tatsuma; Nakashima, Miho*; Aoki, Dai*; Settai, Rikio*; Onuki, Yoshichika

We have studied the high pressure effect on the antiferromagnetic ground states of uranium heavy fermion compounds. In this paper we show our high pressure studies on UZn by the electrical resistivity measurements. In UZn, the Nel temperature in UZn decreases slightly from 9.66 K at 1 bar to 9.33 K at 2.5 GPa, becomes almost pressure-independent up to 4.7 GPa, and starts to increase at the higher pressure region. We discuss the pressure dependences of the coefficient of term in the electrical resistivity , an antiferromagnetic gap and a characteristic temperature . It is found that the effect of pressure on the electronic states in UZn is weak compared with the other heavy fermion compounds.