NpAs2: Magnetic form factor and tentative crystal field model |
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| Authors: | A Delapalme J Mulak A Blaise JM Fournier |
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| Institution: | Laboratoire Léon Brillouin, CEN-SACLAY, 91 191 Gif sur Yvette Cedex, France;IBTRS, Acad. Polon. des Sciences, 50-950 Wroclaw, Poland;Centre d''Etudes Nucléaires de Grenoble, Département de Recherche Fondamentale, Section de Physique du Solide, 85 X, 38041 Grenoble Cedex, France |
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| Abstract: | A polarized neutron diffraction experiment at 4.2 K was carried out on two NpAs2 single crystals with different orientations of the crystallographic axes with respect to the magnetic field. Low temperature atomic positions are given together with the Fermi length of the Np atom: 1.015X10-12cm. The valence state of the Np ion is 4+, the ordered moment value is 1.46μB, a strong magnetocrystalline anisotropy and a field variation of the ordering temperature have been evidenced for the ferromagnetic state. 58 magnetic structure factors have been measured. A tentative crystal field model is presented. |
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