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O NMR study in (Pu0.91Am0.09)O2 |
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| Authors: | Yo Tokunaga Masahiko Osaka Shuhei Miwa Hiroyuki Chudo Yoshinobu Shiokawa |
| Affiliation: | a Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Naka, Ibaraki 319-1195, Japan b Oarai Research and Development Center, Japan Atomic Energy Agency, Oarai, Higashi-Ibaraki, Ibaraki 311-1393, Japan c Institute for Materials Research, Tohoku University, Oarai, Higashi-Ibaraki, Ibaraki 311-1313, Japan |
| Abstract: | In order to investigate the magnetic properties of Am4+ ions in the cubic fluorite structure, we have performed 17O NMR measurements on (Pu0.91Am0.09)O2. We have observed a temperature-dependent 17O NMR line broadening induced by classical dipolar hyperfine fields from the Am 5f moments. From NMR line simulations, the effective moment of the Am moments has been estimated to be μeff=1.38μB/Am. This value is comparable with μeff=1.32 or 1.53μB/Am reported for AmO2. We have also carried out nuclear relaxation measurements for 17O nuclei. The magnetization recovery has been found to exhibit a nonexponential time dependence with an exponent β∼0.5. This result is well understood in terms of the nuclear relaxation mechanism induced by the Am 5f moment fluctuations via dipolar hyperfine fields. |
| Keywords: | Plutonium dioxide Americium dioxide 17O NMR Magnetic moment |
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