Proprietes electriques et magnetiques de Mn0,25NbS2 et Mn0,33NbS2 |
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| Authors: | Annie Le Blanc-Soreau Jean Rouxel Marie-France Gardette Ouri Gorochov |
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| Affiliation: | Laboratoire de Chimie Minérale A, U.E.R. de Chimie B.P. 1044 - 44037 Nantes Cédex, France;Laboratoire de Chimie Minérale et Structurale (LA 200) U.E.R. des Sciences Pharmaceutiques et Biologiques Université René Descartes, 4, Avenue de l''Observatoire 75270 - Paris Cédex 06 France |
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| Abstract: | Crystals of Mn0.25NbS2 and Mn0.33NbS2 phases were grown by iodine vapor transport. Their accurate composition has been determined and single phase specimens used for studies of magnetic and electrical properties. Both compounds show ferromagnetic interactions at low temperature. Curie paramagnetic temperatures are 120°K for Mn0.25NbS2 and 53°K for Mn0.33NbS2. The experimental magnetic moments indicate an intermediate valence state (between +2 and +3) for manganese in the compounds. Resistivity and Hall measurements show a metallic character and coincide with the intermediate valence state. Interpretations are given in terms of a simple band model, and an analysis of the magnetic interactions is proposed. |
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