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Effets de valence dans les composés base manganèse isotypes de HfFe6Ge6 ou ses variantes : Matériaux magnétoréfrigérants

Abstract : The first part of this work concerns the study of the magnetic and magnetoresistance properties of RMn6X6-xX x (X, X = Sn, Ge, Ga, In) compounds known as 166 with non trivalent R element [R= tetravalent (Hf, Zr), divalent (Mg, Yb) and monovalent (Li) element]. In this part of the study, our result confirm at the same time the dependence of the magnetic properties with the valence electron concentration (VEC) and the fact that the parameters such as the interatomic Mn-Mn distances or the electronic configuration of the layer of valence of R element take part, with a less degree, to define the magnetic behaviour of these phases. Finally, the last of this work concerns the identification of the magnetocaloric properties of these 166 compounds and that of some binary of formulas Mny(Sn, Ga)z. In the case of 166 compounds, the magnetocaloric effect is insufficient to consider use these materials in the technological applications. On the other hand in the case of Mn3Sn2, the presence of two successive ferromagnetic transitions involves a magnetocaloric response to two peaks. The form and extended in temperature of Mn3Sn2 is interesting for the thermodynamic effectiveness, which classifies this material among the promising candidates for future magnetic refrigeration applications.
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Submitted on : Friday, March 30, 2018 - 9:43:57 AM
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Hilaire Ihou-Mouko. Effets de valence dans les composés base manganèse isotypes de HfFe6Ge6 ou ses variantes : Matériaux magnétoréfrigérants. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10151⟩. ⟨tel-01754295⟩



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