A cascade of magnetic field induced spin transitions in LaCoO3

Abstract

We present magnetization and magnetostriction studies of the insulating perovskite LaCoO3 in magnetic fields approaching 100 T. In marked contrast with expectations from single-ion models, the data reveal two distinct first-order spin transitions and well-defined magnetization plateaux. The magnetization at the higher plateau is only about half the saturation value expected for spin-1 Co3+ ions. These findings strongly suggest collective behavior induced by strong interactions between different electronic -- and therefore spin -- configurations of Co3+ ions. We propose a model of these interactions 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.

5 pages + supplementary materials, 5 figures

References in corpus (3)

• Monte Carlo simulation of pressure-induced phase transitions in spin-crossover materials
• High resolution magnetostriction measurements in pulsed magnetic fields using Fibre Bragg Gratings
• Spin-state transition and spin-polaron physics in cobalt oxide perovskites: ab initio approach based on quantum chemical methods

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