Abstract
The optical4 I 15/2→4 S 3/2 transition of Er3+ in single crystal ErCrO3 has been studied with polarized light as a function of temperature between 1.7 and 140 °K and of applied magnetic fields in the temperature region between 1.7 and 10 °K. The temperature dependence of the ground state splitting has been deduced from these measurements. ErCrO3 undergoes a spin reorientation with a reorientation temperature depending on applied external field. The reorientation temperature in zero field was determined to beT r =9.4±0.5 °K. The experiments in external magnetic field along thez-axis have given the magnetic moment of the Er3+ ions to be μ z =5.55 (±0.45) μ b and the reorientation fieldH as a function of temperature. Specific heat and magnetization data have been calculated from the optical data of the Er3+ ground state and compared with recent specific heat and magnetization studies in ErCrO3 by other authors.
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