Journal
EPL
Volume 94, Issue 4, Pages -Publisher
EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
DOI: 10.1209/0295-5075/94/47004
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Funding
- DAE-SRC Research Investigator Award
- DST India
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Several double perovskite materials of the form A(2)BB'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 already known from studies of uncorrelated disorder, but lead to a dramatic enhancement of the low-field magnetoresistance. Copyright (C) EPLA, 2011
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