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High-pressure electrical resistivity measurement on heavy fermion superconductor URu$$_2$$Si$$_2$$ using super clean crystal

Tateiwa, Naoyuki  ; Matsuda, Tatsuma; Haga, Yoshinori ; Yamamoto, Etsuji ; Onuki, Yoshichika

We have measured the electrical resistivity of URu$$_2$$Si$$_2$$ under high pressure using a high quality single crystal sample. The pressure phase diagram was re-investigated. With increasing pressure, the transition temperature $$T_0$$ from the paramagnetic to the "hidden order" states increases and the superconducting transition temperature $$T_{sc}$$ decreases simply. Below $$P_x$$, a power law exponent $$n$$ smaller than 2 is required to represent the data and the values of $$n$$ are generally about 1.5 $$pm$$ 0.1. Above $$P_x$$, $$n$$ increases with increasing pressure and the value is about 2.0 at 1.51 GPa. It is suggested that the derivation of the exponent $$n$$ from the Fermi liquid theory is intrinsic to the hidden order state.

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