Abstract
The effects of partially replacing Mn with Fe ions in the La 0.85Ca 0.15MnO 3 system are reported. On replacing 5% of the Mn with Fe ions the system exhibits a transition to a re-entrant spin glass like phase with a ferromagnetic transition at 170 K and spin freezing transition at T∼100 K. The system remains insulating throughout both the ferromagnetic and glassy phases with however a sharp resistivity increase at low temperature ( T∼150 K). The spin freezing temperature shifts upwards with increasing frequency and magnetic relaxation effects are observed. However conventional spin glass features such as a memory effect are not observed and the spin freezing temperature is relatively insensitive to applied magnetic fields.
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