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

References in corpus (3)

• Weak charge-lattice coupling requires reinterpretation of stripes of charge order in La1-xCaxMnO3
• Competing Orders and Disorder-induced Insulator to Metal Transition in Manganites
• Insulator to Metal Transition Induced by Disorder in a Model for Manganites

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• Non-magnetic B-site Impurities Induce Ferromagnetic Tendencies in CE Manganites
• Fragility of the A-type AF and CE Phases of Manganites: An Exotic Insulator-to-Metal Transition Induced by Quenched Disorder
• Disorder-induced orbital ordering in doped manganites