237Np nuclear relaxation rate in heavy fermion superconductor NpPd5Al2
H. Chudo, Y. Tokunaga, S. Kambe, H. Sakai, Y. Haga, T. D. Matsuda, Y. Ōnuki, H. Yasuoka, D. Aoki, Y. Homma, R. E. Walstedt
DOI 10.1103/PhysRevB.84.094402 · Physical Review B
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Abstract
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 1/27T1 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NpPd5Al2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.9 | Pressure not reported | unknown |
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