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Issue 32, 2018
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Hidden magnetic order in plutonium dioxide nuclear fuel

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Abstract

A thorough understanding of the chemistry of PuO2 is critical to the design of next-generation nuclear fuels and the long-term storage of nuclear materials. Despite over 75 years of study, the ground-state magnetic structure of PuO2 remains a matter of much debate. Experimental studies loosely indicate a diamagnetic (DM) ground-state, whereas theoretical methods have proposed either a collinear ferromagnetic (FM) or anti-ferromagnetic (AFM) ground-state, both of which would be expected to cause a distortion from the reported Fm[3 with combining macron]m symmetry. In this work, we have used accurate calculations based on the density functional theory (DFT) to systematically investigate the magnetic structure of PuO2 to resolve this controversy. We have explicitly considered electron-correlation, spin–orbit interaction and noncollinear magnetic contributions to identify a hereto unknown longitudinal 3k AFM ground-state that retains Fm[3 with combining macron]m crystal symmetry. Given the broad interest in plutonium materials and the inherent experimental difficulties of handling this compound, the results presented in this paper have considerable implications for future computational studies relating to PuO2 and related actinide structures. As the crystal structure is coupled by spin–orbit interactions to the magnetic state, it is imperative to consider relativity when creating computational models.

Graphical abstract: Hidden magnetic order in plutonium dioxide nuclear fuel

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Publication details

The article was received on 06 Jun 2018, accepted on 25 Jul 2018 and first published on 26 Jul 2018


Article type: Paper
DOI: 10.1039/C8CP03583K
Citation: Phys. Chem. Chem. Phys., 2018,20, 20943-20951
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    Hidden magnetic order in plutonium dioxide nuclear fuel

    J. T. Pegg, A. E. Shields, M. T. Storr, A. S. Wills, D. O. Scanlon and N. H. de Leeuw, Phys. Chem. Chem. Phys., 2018, 20, 20943
    DOI: 10.1039/C8CP03583K

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