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- W2091206272 abstract "Dans le composé BaLa2Fe2O7, les ’pins ont au dessous de 235 K une configuration antiferromagnétique suivant la diagonale de base de la maille quadratique. A partir de cette température, nous avons observé par diffraction neutronique une rotation continue des moments magnétiques dans le plan de base xyO, la configuration restant toujours antiferromagnétique: la symétrie magnétique passe du groupe de Shubnikov Ipm′mm′ au groupe P2′/m. A cette même température nous observons une discontinuité du coefficient de dilatation thermique. Nous discutons le phénomène dans le cadre de la théorie des transitions du 2e ordre de Landau. In the compound BaLa2Fe2O7, below 235 K, spins are oriented along the diagonal of the quadratic cell in an antiferromagnetic configuration. Above this temperature we observe by neutron diffraction a continuous rotation of the magnetic moments in the base plane xyO, the configuration remaining antiferromagnetic; the magnetic symmetry goes from Ipm′mm′ to P2′/m Shubnikov's group. At the transition temperature we observe a discontinuity of the thermal expansion coefficient. This phenomenon can be interpreted in agreement with Landau's theory of second order transitions." @default.
- W2091206272 created "2016-06-24" @default.
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- W2091206272 date "1975-06-01" @default.
- W2091206272 modified "2023-09-25" @default.
- W2091206272 title "Rotation des moments magnetiques dans BaLa2 Fe2 O7" @default.
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- W2091206272 doi "https://doi.org/10.1016/0038-1098(75)90828-5" @default.
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