Heat-capacity anomalies at and in the ferromagnetic superconductor UGe

Tateiwa, Naoyuki*; Kobayashi, Tatsuo*; Amaya, Kiichi*; Haga, Yoshinori   ; Settai, Rikio*; Onuki, Yoshichika

We have investigated the specific heat under high pressure in the ferromagnetic superconductor UGe. Specific heat anomalies at the characteristic temperatures , the superconducting transition temperature, and were directly observed from the high-pressure specific heat measurement. The low-temperature electronic specific heat coefficient increases with increasing pressure, corresponding to the formation of heavy-fermion state near the critical pressure.