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Magnetization, specific heat, $$^{17}$$O NMR, and $$^{237}$$Np M$"o$ssbauer study of U$$_{0.15}$$Np$$_{0.85}$$O$$_2$$

U$$_{0.15}$$Np$$_{0.85}$$O$$_2$$の磁化, 比熱, $$^{17}$$O NMRおよび$$^{237}$$Npメスバウアーによる研究

Martel, L.*; Hen, A.*; 徳永 陽; Kinnart, F.*; Magnani, N.*; Colineau, E.*; Griveau, J.-C.*; Caciuffo, R.*

Martel, L.*; Hen, A.*; Tokunaga, Yo; Kinnart, F.*; Magnani, N.*; Colineau, E.*; Griveau, J.-C.*; Caciuffo, R.*

U$$_{0.15}$$Np$$_{0.85}$$O$$_2$$混晶系化合物の磁気,電子状態を磁化,比熱,核磁気共鳴,メスバウアーの各手法を用いて行った。同化合物はT$$_{N}$$=17Kで反強磁性に転移する。異なる測定手法を複合的に用いることで、(1)空間的に変調した磁気モーメント、(2)微小なNpモーメントの出現、7.4Kでの比熱の異常などが明らかになった。本結果をもとにUO$$_2$$とNpO$$_2$$の特性について議論する。

We report a study of the magnetic and electronic properties of the U$$_{0.15}$$Np$$_{0.85}$$O$$_2$$ solid solution, based on dc- and ac- magnetisation, $$^{237}$$Np M$"o$ssbauer spectroscopy, $$^{17}$$O Nuclear Magnetic Resonance (NMR), and specific heat measurements. The compound orders antiferromagnetically at T$$_N$$ = 17 K. The different techniques reveal the complexity of this system with:(1) a spatial distribution of ordered moments, (2) a small Np ordered moment, and (3) an additional specific heat anomaly at 7.4 K, with a residual value at very low temperature and a reduced magnetic entropy. The results are compared to the end-members of the series, UO$$_2$$ and NpO$$_2$$, as well as to the other solid solutions previously reported in this system. We discuss how the properties of U$$_{0.15}$$Np$$_{0.85}$$O$$_2$$ add new input to the trend previously reported for the series, in view of the models that have been previously proposed.

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パーセンタイル:100

分野:Materials Science, Multidisciplinary

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