Magnetic properties of neptunium diarsenide |
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| Authors: | A Blaise JM Fournier D Damien A Wojakowski JP Charvillat |
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| Institution: | Centre d''Études Nucléaires de Grenoble, Département de Recherche Fondamentale, Section de Physique du Solide, 85X-38041 Grenoble, Cedex, France;Centre d''Études Nucléaires de Fontenay aux Roses, BP 6, 92260 Fontenay aux Roses, France;SAP-Etablissement de Marcoule, BP 170, 30200 Bagnols sur Ceze, France |
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| Abstract: | The magnetic properties of a collection of single crystals of NpAs2 have been investigated in the temperature range 4.2-300 K and in applied fields up to 100 kOe. For small magnetic fields (3 kOe), NpAs2 is ferromagnetic up to TIC=18 K, antiferromagnetic from 28 K to TN=52 K, then paramagnetic. Both transitions are first order. When the applied field increases TIC is shifted towards TN. The antiferromagnetic phase disappears for H#62;30 kOe. The ferromagnetic range is characterized by a very large anisotropy. In the paramagnetic state, NpAs2 has an effective moment 1.88 μB. |
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