Abstract
We examine the nuclear spin–lattice relaxation rates 1 / T 1 of PuRhGa 5 and PuCoGa 5 , in particular, in normal state. PuRhGa 5 exhibits a gradual suppression of ( T 1 T ) - 1 below 25 K far above T c ∼ 8.5 K , while measurements for PuCoGa 5 reveal a monotonic increase down to T c . We propose that this behavior is consistently understood by the crossover from the two-dimensional quantum antiferromagnetic regime of the local 5f-electron spins of Pu to the concomitant formation of the fermion pseudogap based on the two-component spin-fermion model.
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