Abstract
Photoinduced ‘transient thermoelectric effect (TTE)’ in perovskite manganite La 0.6Ca 0.4MnO 3 thin film has been measured under magnetic fields. The fast decay process of TTE signals is due to a recombination of photogenerated electron–hole pairs through Mn 4+ ions as capture centers, whose evaluated cross section σ obeys the power law σ∝ T − n ( n=0.75) in the ferromagnetic phase far below T c and in the paramagnetic phase. From the observed relaxation time τ 1, we evaluated the parameter α characterizing a small polaron effect and the effective mass m ∗; both are enhanced appreciably near T c. Such anomaly is attributed to the change in the thermal velocity of diffusing holes with downspin due to a small polaron effect.
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