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Enhancement of relaxation rates in the normal state of superconductor PuRhGa$$_5$$:NQR relaxation study

Sakai, Hironori   ; Kambe, Shinsaku  ; Tokunaga, Yo  ; Fujimoto, Tatsuya; Walstedt, R. E.*; Yasuoka, Hiroshi; Aoki, Dai*; Homma, Yoshiya*; Yamamoto, Etsuji  ; Nakamura, Akio; Shiokawa, Yoshinobu*; Nakajima, Kunihisa  ; Arai, Yasuo; Matsuda, Tatsuma; Haga, Yoshinori   ; Onuki, Yoshichika*

The spin-lattice relaxation rates ($$1/T_1$$) have been measured under zero fieldusing nuclear quadrupole resonance (NQR) linesin superconductor PuRhGa$$_5$$ and Pauli-paramagnet LuCoGa$$_5$$. In the reference LuCoGa$$_5$$ with fully-occupied $$4f$$ shell, the $$1/T_1$$ shows the constant behavior of $$(T_1T)^{-1}=0.495pm0.002$$ (sec$$cdot$$K)$$^{-1}$$. On the other hand, in PuRhGa$$_5$$, $$1/T_1$$ is much larger than in LuCoGa$$_5$$and the $$1/T_1propto T$$ behavior below $$sim$$30 K is seen, where its $$(T_{1}T)^{-1}$$ value is 3.27 $$pm$$ 0.005 (sec$$cdot$$K)$$^{-1}$$. These results suggest a development of coherent Fermi liquid stateincorporated with $$5f$$ electronsbelow $$sim$$30 K in PuRhGa$$_5$$.



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