Abstract
The effect of magnetic field on the photovoltaic effect (PVE) has been investigated for a manganite-based heterojunction composed of a La0.7Ce0.3MnO3 film and a 0.5 wt % Nb-doped SrTiO3 substrate. A linear decrease in the photovoltage (Voc) with magnetic fields is observed and the relative variation of Voc [defined as 1−Voc(H)∕Voc(0)] is larger than 10% under a field of 0.5 T at a temperature T=16.5K. There is a proportional relation between ΔVoc and the magnetoresistance of the heterojunction. We attribute the modulation of PVE to variation of magnetization and resistance of depletion layer by external magnetic fields.
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