Effect of A-site disorder of heavier rare earth ion on structural, magnetic and transport properties of lanthanum based chromium manganite perovskite system
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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 (<rA>). 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.
Authors are thankful to University Grants Commission, New Delhi for financial support vide Ref. No. 20/12/2015 (11) EU-V (Sr. No. 21215101B1). Authors are also thankful to Director, Advanced Materials Research Centre, IIT Mandi, for recording XRD. Thanks are also due to Prof. Ramesh Chandra, Institute Instrumentation Centre, Indian Institute of Technology, Roorkee, for recording EDX and SEM.
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Conflict of interest
The authors declare that they have no conflict of interest.