Abstract
For the first time, the effect of Ta 5+ substitution at the Mn site of La 0.67Ca 0.33MnO 3 compound is reported. A significant increase in lattice parameters and unit cell expansion indicate larger structural modification upon substitution. The ferromagnetic-metallic ground state is modified to a cluster glass insulator for x > 0.03 . The observed suppression of the ferromagnetic transition temperature T c of ∼39 K/at% might be the highest reported in Mn-site substituted La 0.67Ca 0.33MnO 3. The well-known effects of changed carrier density, larger average ionic radius at Mn site and dilution of Mn sublattice appear insufficient to explain this strong suppression of T C.
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