NMR studies of actinide dioxides

NMR studies of actinide dioxides,10.1016/j.jallcom.2007.03.082,Journal of Alloys and Compounds,Y. Tokunaga,H. Sakai,T. Fujimoto,S. Kambe,R. E. Walsted

NMR studies of actinide dioxides  
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Y. Tokunaga, H. Sakai, T. Fujimoto, S. Kambe, R. E. Walstedt, K. Ikushima, H. Yasuoka, D. Aoki, Y. Homma, Y. Haga, T. D. Matsuda, S. Ikeda
O17 NMR measurements have been performed on a series of the actinide dioxides, UO2, NpO2 and PuO2. Although the O17 NMR spectra in these materials are similar at higher temperatures, the low-temperature spectra present are significantly different. In UO2 we have observed a wide spectrum, forming a rectangular shape below TN=30 K. In NpO2, on the other hand, the spectra broaden rather gradually and exhibit a two-peak structure below T0=26 K. In PuO2, neither spectrum broadening nor splitting has been observed. We show that these NMR spectra clearly indicate the different nature of the low-temperature magnetic ground states in these actinide compounds.
Journal: Journal of Alloys and Compounds - J ALLOYS COMPOUNDS , vol. 444, pp. 241-245, 2007
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