Abstract
In order to study the effect of A-site cation mismatch on the structural, magnetic and transport properties, a systematic investigation of La0.6R0.1Ca0.3Mn0.9Cr0.1O3 (A = La, Eu and Ho) has been undertaken. Rietveld analysis of powder x-ray diffraction data revealed that all the compounds crystallize in the orthorhombic symmetry with Pbnm space group. Temperature dependent magnetization studies showed that all our investigated compounds exhibit a paramagnetic-ferromagnetic transition at low temperature with Curie temperature (Tc) decreases with decrease in average A-site ionic radius ( ). The materials show metal–semiconductor transition at low temperature and the values of metal–semiconductor transition temperature (TMS) are found to be much lower than Curie temperatutre (Tc). It has been concluded that the conduction mechanism was dominated by small polaron hopping model in the high temperature paramagnetic semiconducting region.
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