Magnetization, specific heat, O 17 NMR, and Np 237 Mössbauer study of U0.15 N p0.85 O2

Laura Martel, Amir Hen, Yo Tokunaga, François Kinnart, Nicola Magnani, Eric Colineau, Jean Christophe Griveau, Roberto Caciuffo

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Abstract

We report a study of the magnetic and electronic properties of the U0.15Np0.85O2 solid solution, based on dc- and ac magnetization, Np237 Mössbauer spectroscopy, O17 nuclear magnetic resonance, and specific heat measurements. The compound orders antiferromagnetically at TN=17K. The different techniques reveal the complexity of this system with: (i) a spatial distribution of ordered moments, (ii) a small Np ordered moment (μNp=0.3μB), and (iii) 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, UO2 and NpO2, as well as to the other solid solutions previously reported in this system. We discuss how the properties of U0.15Np0.85O2 add input to the trend previously reported for the series in view of the models that have been proposed.

Original languageAmerican English
Article number014410
JournalPhysical Review B
Volume98
Issue number1
DOIs
StatePublished - 5 Jul 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018 American Physical Society.

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