Site-selective magnetic order of neptunium in Np2Ni17

Abstract : We present the results obtained by superconducting quantum interference device (SQUID) magnetometry, specific heat, and Mossbauer spectroscopy measurements carried out on Np2Ni17 polycrystalline samples. We show that long-range magnetic order, with a moment mu((2b)) similar to 2.25 mu(B), occurs below T-N = 17.5 K on the Np (2b) sites. A nontrivial situation is observed in that the other Np sites (2d) do not take part to the order transition and carry only an induced moment of about 0.2 mu(B) below T-N. A combined analysis of the different experimental data sets allowed us to determine key parameters associated with the electronic structure of the system. The experimental results are discussed against first-principles electronic structure calculations based on the spin-polarized local spin density approximation plus Hubbard interaction.
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Physical Review B : Condensed matter and materials physics, American Physical Society, 2015, 92 (2), pp.024410. 〈10.1103/PhysRevB.92.024410〉
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Contributeur : Jérôme Planès <>
Soumis le : jeudi 5 octobre 2017 - 12:34:48
Dernière modification le : vendredi 6 avril 2018 - 12:26:10

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A. Hen, N. Magnani, J. C. Griveau, R. Eloirdi, Eric Colineau, et al.. Site-selective magnetic order of neptunium in Np2Ni17. Physical Review B : Condensed matter and materials physics, American Physical Society, 2015, 92 (2), pp.024410. 〈10.1103/PhysRevB.92.024410〉. 〈hal-01611026〉

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