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We report detailed structural, electrical, magnetic and specific heat studieson La0.7Ca0.3Mn1-xCrxO3 manganites. Rietveld analysis of fitted and observedXRD patterns exhibited the single-phase nature of all the studied materials,which crystallize in Pbnm space group. Successive substitution of Cr at Mn sitein La0.7Ca0.3Mn1-xCrxO3 manganites increases the electrical resistivity anddecrease the characteristic insulator-metal transition temperature (TIM) of theparent compound along with a hump like feature for higher Cr-content samples.The hump structure basically signifies the onset of anti-ferromagnetic (AFM)interactions as inferred by both the magnetic and infra-red (IR) spectroscopystudies. The systematic suppression of FM state results in a spin glass (SG)like behavior. IR studies revealed that the vibration mode at 413 cm-1 beingassociated with internal bending of MnO6 octehedra, becomes softer, indicatingan increase in distortion and hence the possible spin glass behavior. Thecritical exponents alpha, beta and gama are calculated from the heat capacity(CP) data near the TIM/TFM. The same exhibited variations of their values withdoping. In particular the value of beta increases from 0.37 to 0.43, clearlyindicating the coexistence of both long and short range magnetic orders i.e.tendency towards SG state for Cr doped samples. On the basis of presentresults, it is suggested that Cr dilutes double-exchange (DE) based FM andrather promotes the AFM based super exchange interactions (SE) via Cr3+/Mn4+ions. Substitution of Cr systematically destroys both the metallic state andlong range ferromagnetic (FM) order.

Structural, electrical, magnetic and thermal studies of Cr-doped La0.7Ca0.3Mn1-xCrxO3 for x = 0.0 to 1.0 manganites