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$$^{237}$$Np nuclear relaxation rate in heavy fermion superconductor NpPd$$_5$$ Al$$_2$$

Chudo, Hiroyuki; Tokunaga, Yo; Kambe, Shinsaku; Sakai, Hironori; Haga, Yoshinori; Matsuda, Tatsuma; Onuki, Yoshichika; Yasuoka, Hiroshi; Aoki, Dai*; Homma, Yoshiya*; Walstedt, R. E.*

$$^{27}$$Al nuclear spin-lattice relaxation rate 1/$$^{27}$$$$T$$$$_1$$ has been measured in heavy fermion superconductor NpPd$$_5$$Al$$_2$$ for a wide range of external fields between 0.7 and 11 T. We found that 1/$$^{27}$$$$T$$$$_1$$ exhibits a strong, field-dependent behavior at low fields below $$H$$ $$sim$$ 3 T, which is attributed to unlike-spin cross relaxation between $$^{237}$$Np and $$^{27}$$Al. An analysis based on the cross relaxation process allows us to make the first quantitative estimates of the Np nuclear relaxation rate 1/$$^{237}$$$$tau$$ in an itinerant 5$$f$$ electron system. The estimated values of 1/$$^{237}$$$$tau$$ $$sim$$ 6 $$times$$ 10$$^7$$ s$$^{-1}$$, with a weak temperature variation, are below the resolution of NMR relaxation times, indicating that a direct observation of the $$^{237}$$Np NMR signal would be very difficult, at least in the paramagnetic state. It is proposed that a direct observation of $$^{237}$$Np NMR might be possible in the superconducting state at $$T$$ $$sim$$ 1K.

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Category:Materials Science, Multidisciplinary

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