Disorder-Induced First Order Transition and Curie Temperature Lowering in Ferromagnatic Manganites

Abstract

We study the effect that size disorder in the cations surrounding manganese ions has on the magnetic properties of manganites. This disorder is mimic with a proper distribution of spatially disordered Manganese energies. Both, the Curie temperature and the order of the transition are strongly affected by disorder. For moderate disorder the Curie temperature decreases linearly with the the variance of the distribution of the manganese site energies, and for a disorder comparable to that present in real materials the transition becomes first order. Our results provide a theoretical framework to understand disorder effects on the magnetic behavior of manganites.

4 pages, three figures included

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• Non-magnetic B-site Impurities Induce Ferromagnetic Tendencies in CE Manganites
• Beating no-go theorems by engineering defects in quantum spin models
• Fragility of the A-type AF and CE Phases of Manganites: An Exotic Insulator-to-Metal Transition Induced by Quenched Disorder
• Steady states and phase transitions in heterogeneous asymmetric exclusion processes
• Constructive Interference Between Disordered Couplings Enhances Multiparty Entanglement in Quantum Heisenberg Spin Glass Models
• Disorder-induced orbital ordering in doped manganites
• Substitutional disorder and charge localization in manganites