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Report No.

$$^{17}$$O NMR spin-lattice relaxation in NpO$$_2$$; Field-dependent cross-relaxation process driven by $$^{237}$$Np spins

Tokunaga, Yo  ; Walstedt, R. E.*; Homma, Yoshiya*; Aoki, Dai*; Kambe, Shinsaku  ; Sakai, Hironori   ; Fujimoto, Tatsuya; Ikeda, Shugo; Yamamoto, Etsuji  ; Nakamura, Akio; Shiokawa, Yoshinobu*; Yasuoka, Hiroshi

In this paper, we report a comprehensive study of $$^{17}$$O nuclear spin-lattice relaxation in NpO$$_2$$ for a wide range of fields and temperatures. In both the paramagnetic and ordered-state regions, a strong, field-dependent $$^{237}$$Np -$$^{17}$$O nuclei cross-relaxation process is observed in addition to the expected background rate. The cross relaxation process, driven by the $$^{237}$$Np spins, is conveyed to the $$^{17}$$O via a greatly enhanced indirect nuclear spin-spin coupling which is described and reported here for the first time. The magnitude and temperature dependence of the indirect coupling are in reasonable accord with a simple theoretical model. The magnitude and temperature dependence of the $$^{237}$$Np $$T_1$$ process are also deduced from the data obtained.



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Category:Chemistry, Multidisciplinary



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