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

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

2006-02-16

arxiv.org/abs/cond-mat/0602392v1

Physical Review B, {\bf 73}, 214404 (2006)

Physics

Condensed Matter

Materials Science

4 pages, three figures included

Scientific paper

10.1103/PhysRevB.73.214404

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.

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