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Influence de la composition chimique sur le comportement physique des germaniures ternaires appartenant au système Ce-Ni-Ge. Détermination des structures magnétiques.

Abstract : The investigation of the Ce-Ni-Ge system have permitted to establish strong correlations between physical properties of these germanides (governed by the Ce-ground state, result of a competition between Kondo and RKKY magnetic interactions) and their chemical composition. In the same phase diagram, we have taken in evidence that : (i) germanides richer in Ni are intermediate valence systems (CeNiGe, Ce3Ni4Ge4 et CeNi4.25Ge0.75) or "Heavy Fermion" systems (CeNi2Ge2 et CeNi9Ge4). Moreover, in the sequence CeNi2Ge2 → Ce3Ni4Ge4 → CeNiGe, the intermediate valence character is more and more present; (ii) germanides richer in Ge (more than 50% Ge-atomic percentage) order antiferromagnetically with Néel temperature TN decreasing with Ge-content in compounds Ce2NiGe6 → Ce3Ni2Ge7 → CeNiGe3 → Ce2Ni3Ge5 → CeNiGe2. Their magnetic structures have been determined by neutron diffraction and the Ce3+-magnetic moment value obtained at 1.4 K decrease in the same time showing the strength of the Kondo effect.
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Submitted on : Monday, October 20, 2003 - 5:45:54 PM
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Laurence Durivault. Influence de la composition chimique sur le comportement physique des germaniures ternaires appartenant au système Ce-Ni-Ge. Détermination des structures magnétiques.. Autre. Université Sciences et Technologies - Bordeaux I, 2002. Français. ⟨tel-00003607⟩

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