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MM Altarawneh GW Chern N Harrison CD Batista A Uchida M Jaime DG Rickel SA Crooker CH Mielke JB Betts JF Mitchell MJ Hoch 《Physical review letters》2012,109(3):037201
We present magnetization and magnetostriction studies of LaCoO_{3} in magnetic fields approaching 100?T. In contrast with expectations from single-ion models, the data reveal two distinct first-order transitions and well-defined magnetization plateaus. The magnetization at the higher plateau is only about half the saturation value expected for spin-1 Co^{3+} ions. These findings strongly suggest collective behavior induced by interactions between different electronic configurations of Co^{3+} ions. We propose a model that predicts crystalline spin textures and a cascade of four magnetic phase transitions at high fields, of which the first two account for the experimental data. 相似文献