Magnetic and transport properties of La0.7Te0.3CrO3

The structural, magnetic and transport properties in the compound La0.7Te0.3CrO3 have been investigated. The sample shows an orthorhombic structure with the space group Pbnm. The sample exhibits two magnetic transitions corresponding to the transition from a paramagnetic (PM)-antiferromagnetic (AFM) transition at 282 K, and an AFM-ferromagnetic (FM) transition at about 105 K, which is presumed to originate from the exchange interaction between Cr2+ and Cr3+ ions mediated by O2− ions. The temperature dependence of resistivity ρ(T) curve displays the semiconducting behavior (dρ/dT<0) over whole measured temperature range. Based on the results of the magnetic and transport properties in La0.7Te0.3CrO3, it is suggested that the exchange interaction of Cr2+OCr3+ is of the nature of superexchange interaction rather than double exchange interaction.