Magnetic characteristics of La-deficient manganate single crystals

Abstract In (La 1− x ) 0.8 Ca 0.2 MnO 3 ( x =0, 0.05, 0.1, 0.2 and 0.3) single crystals, magnetic anomalies as spin-glass behavior appear at low temperatures below T c in zero-field-cooled magnetization curves for x =0 and 0.05 compositions but disappear at higher x -values. The charge/orbital fluctuations are reinforced for x =0 and 0.05 compositions rather than the others. The ferromagnetic metallic clusters imbedding in the insulating paramagnetic matrix are realized in the crystal with x =0.2 composition.