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Etude des propriétés structurales, magnétiques et électriques des solutions solides RMn6X6-xX'x (R=Gd-Lu, Sc, Y ; X=Ge, Sn ; X'=Ga, In) isotopes de HfFe6Ge6

Abstract : This thesis reports on the structural, magnetic and electrical properties of pseudo-ternary RMn6X6-xX'x (R = Gd-Lu, Y, Sc ; X = Ge, Sn ; X' = Ga, In) isotypic with HfFe6Ge6. The determination of the atomic coordinates allows us to specify the crystalchemistry of these materials. We have thus shown that substitution occurs in the site which maintains the shortest R-Mn length. This work displays the dominating role of the valence electron concentration on the evolution of the magnetic properties of these compounds. We have specified the interactions model in the RMn6X6 compounds which seem to be governed by ferromagnetic interactions between first plane and by an antiferromagnetic interaction for the next one plane. Finally, the conductivity studies display anisotropic transport properties.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2004_0064_LEFEVRE.pdf
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https://hal.univ-lorraine.fr/tel-01746542
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Submitted on : Thursday, March 29, 2018 - 10:39:59 AM
Last modification on : Wednesday, March 24, 2021 - 10:24:04 AM

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Christophe Lefevre. Etude des propriétés structurales, magnétiques et électriques des solutions solides RMn6X6-xX'x (R=Gd-Lu, Sc, Y ; X=Ge, Sn ; X'=Ga, In) isotopes de HfFe6Ge6. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2004. Français. ⟨NNT : 2004NAN10064⟩. ⟨tel-01746542⟩

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