État expérimental de la question de l'antiferromagnétisme

Abstract

Dans son rapport, l'auteur montre, d'une part que les résultats expérimentaux s'interprètent bien en supposant que les interactions négatives entre les ions magnétogènes sont du type indirect de Kramers, qu'elles se font par l'intermédiaire des anions et, d'autre part, que l'étude de l'anisotropie magnétique au-dessous de T03BB permet, dans quelques cas simples, de déterminer la ou les directions d'antiferromagnétisme spontané.

Verification of the de Wolff hypothesis concerning the symmetry of β-MnO2

“…' This study is devoted to a symmetry-properties relationship in -MnO 2 and also MnF 2 . The motivation to choose these two Mn compounds is based on the similarities of their crystal structures (Baur, 2007) and considerable differences in their magnetic properties (Bizette, 1951). The rutile-type crystal structure of both -MnO 2 and MnF 2 is described with the tetragonal space group P4 2 /mnm (Baur, 2007).…”

First-principles study of pressure-induced magnetic transition in siderite FeCO3

“…So the Fe 2+ ions can adopt a high spin (HS, S = 2) or low spin (LS, S = 0) state. Magnetic susceptibility and neutron-diffraction experiments have indicated that FeCO 3 was an antiferromagnetic (AFM) compound with a low Néel temperature of 38 K [4][5][6][7][8]. All the magnetic moments (Fe 2+ ion) are ferromagnetically (FM) coupled inside a (0 0 0 1) Fe plane, whereas neighboring planes along the c axis are antiferromagnetically coupled.…”

Interface and electronic characterization of thin epitaxial films

“…Meanwhile, the high temperature CoO phase crystallizes in the rock salt structure. Both oxides are antiferromagnetic at low temperatures, with Néel temperatures of approximately 40 and 290 K, respectively [1][2][3][4][5][6][7][8].…”