Antisite Domains in Double Perovskite Ferromagnets: Impact on Magnetotransport and Half-metallicity

Details Antisite Domains in Double Perovskite Ferromagnets: Impact on Magnetotransport and Half-metallicity Antisite Domains in Double Perovskite Ferromagnets: Impact on Magnetotransport and Half-metallicity

2010-09-09

arxiv.org/abs/1009.1702v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, pdflatex, EPL style

Scientific paper

Several double perovskite materials of the form A_2BB'O_6 exhibit high ferromagnetic T_c, and significant low field magnetoresistance. They are also a candidate source of spin polarized electrons. The potential usefulness of these materials is, however, frustrated by mislocation of the B and B' ions, which do not organise themselves in the ideal alternating structure. The result is a strong dependence of physical properties on preparative conditions, reducing the magnetization and destroying the half-metallicity. We provide the first results on the impact of spatially correlated antisite disorder, as observed experimentally, on the ferromagnetic double perovskites. The antisite domains suppress magnetism and half-metallicity, as expected, but lead to a dramatic enhancement of the low field magnetoresistance.

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