237Np nuclear relaxation rate in heavy fermion superconductor NpPd 5Al2

H. Chudo, Y. Tokunaga, S. Kambe, H. Sakai, Y. Haga, T. D. Matsuda, Y. Onuki, H. Yasuoka, D. Aoki, Y. Homma, R. E. Walstedt

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5 Citations (Scopus)


27Al nuclear spin-lattice relaxation rate 1/27T1 has been measured in heavy fermion superconductor NpPd5Al2 for a wide range of external fields between 0.7 and 11 T. We found that 1/27T 1 exhibits a strong, field-dependent behavior at low fields below H∼3 T, which is attributed to unlike-spin cross relaxation between 237Np and 27Al. An analysis based on the cross relaxation process allows us to make the first quantitative estimates of the Np nuclear relaxation rate 1/237τ in an itinerant 5f electron system. The estimated values of 1/237τ∼6×107 s-1, with a weak temperature variation, are below the resolution of NMR relaxation times, indicating that a direct observation of the 237Np NMR signal would be very difficult, at least in the paramagnetic state. It is proposed that a direct observation of 237Np NMR might be possible in the superconducting state at T∼1 K.

Original languageEnglish
Article number094402
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number9
Publication statusPublished - 2011 Sept 6


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