Abstract
The ferrimagnetic double perovskites can have high Curie temperatures TC above 600K. In the system Sr2FeMoO6 (TC≈420K) electron doping by substituting, for example, La3+ for Sr2+ ions leads to a considerable increase in TC. Here we report the same effect for LaxCa2−xCrWO6. This demonstrates that electron doping generically increases TC in the ferrimagnetic double perovskites. However, in the system Sr2CrWO6 (TC≈450K) the preferential formation of LaCrO3 prevents electron doping by La substitution as supported by neutron scattering and x-ray diffraction.
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