17O NMR spin-lattice relaxation in NpO2: Field-dependent cross-relaxation process driven by 237Np spins

Y. Tokunaga, R. E. Walstedt, Y. Homma, D. Aoki, S. Kambe, H. Sakai, T. Fujimoto, S. Ikeda, E. Yamamoto, A. Nakamura, Y. Shiokawa, H. Yasuoka

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We have performed 17O NMR spin-lattice relaxation measurements with conventional NMR techniques on 17O in NpO2. The results have been found to exhibit a field-dependent cross-relaxation effect from 237Np in addition to the field-independent exchange-fluctuation background rate which dominates at high fields. Analysis of the cross-relaxation process reveals a temperature-independent relaxation rate as well as a greatly enhanced unlike spin-spin coupling between the 237Np spins and their 17O nearest neighbors. We discuss the possibility of observing the cross-relaxation effects in other actinide dioxides.

Original languageEnglish
Pages (from-to)2016-2019
Number of pages4
JournalJournal of Physics and Chemistry of Solids
Volume68
Issue number11
DOIs
Publication statusPublished - 2007 Nov

Keywords

  • A. Oxides
  • D. Magnetic properties
  • D. Nuclear magnetic resonance (NMR)

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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