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Electronic structure of the NpMT 5 (M = Fe, Co, Ni; T = Ga, In) series of neptunium compounds

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Abstract

Evolution of the electronic structure of the NpMGa5 (M = Fe, Co, Ni) series of neptunium compounds, whose crystal structure is similar to that of the known family of Pu115 superconductors, was studied by the LDA + U + SO method. The calculations took into account both the strong electron correlations and the spin‒orbit coupling in the 5f shell of neptunium. For the first time, the electronic structure was calculated for a hypothetical series of compounds in which gallium is replaced with indium. Parameters of the crystal structure of the given series were obtained using the relationship between the parameters of the crystal structure of the earlier-studied compounds PuCoGa5 and PuCoIn5. The analysis of the electronic structure and characteristics of neptunium ions calculated in the framework of the LDA + U + SO method showed that the neptunium ions in NpMIn5 with M = Fe, Co, and Ni should have an electron configuration closer to f 4, but a spin and magnetic characteristics close to those in NpMGa5.

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Authors and Affiliations

  1. Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Yekaterinburg, 620990, Russia

    A. V. Lukoyanov, A. O. Shorikov & V. I. Anisimov

  2. Ural Federal University, ul. Mira 19, Yekaterinburg, 620002, Russia

    A. V. Lukoyanov, A. O. Shorikov & V. I. Anisimov

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  1. A. V. Lukoyanov
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  2. A. O. Shorikov
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  3. V. I. Anisimov
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Correspondence to A. V. Lukoyanov.

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Original Russian Text © A.V. Lukoyanov, A.O. Shorikov, V.I. Anisimov, 2016, published in Fizika Tverdogo Tela, 2016, Vol. 58, No. 3, pp. 428–432.

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Lukoyanov, A.V., Shorikov, A.O. & Anisimov, V.I. Electronic structure of the NpMT 5 (M = Fe, Co, Ni; T = Ga, In) series of neptunium compounds. Phys. Solid State 58, 438–443 (2016). https://doi.org/10.1134/S1063783416030215

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