Ga NQR relaxation rates in superconductor PuRhGa5PuRhGa5

Nuclear quadupole resonance (NQR) measurements have been performed on the Pu-based superconductor PuRhGa5PuRhGa5 with a transition temperature of ∼8.8K. NQR lines ascribed to Ga69(2), Ga71(2), and Ga69(1) have been found in zero field. Spin–lattice relaxation rate (1/T11/T1) data for these lines have been measured in the superconducting state. The temperature variation of 1/T11/T1 can be interpreted in terms of a line-nodal superconducting gap. Data for both the Ga69(2) and Ga69(1) NQR lines show a constant-T1TT1T behavior between TcTc and T*∼30K, which suggests that a coherent Fermi-liquid state sets in below T*T*. The modified Korringa relation using 1/T11/T1 and Knight shift data in an applied field indicates that the normal state of PuRhGa5PuRhGa5 can be regarded as an antiferromagnetically correlated metal.