Surface ferromagnetism of LaCoO3 crystals

摘要: Abstract Linear and nonlinear magnetic susceptibilities of a LaCoO 3 particle sample were measured to shed light on the surface ferromagnetism . The ferromagnetic transition temperature T C estimated from susceptibility agrees well with that inferred Kouvel–Fisher's analysis linear susceptibility, while critical exponent γ deduced simultaneously same is incompatible any values reported for 2 d ferromagnetism. results are discussed in view and/or size effects detail.