The effect of magnetic field on the photovoltaic effect (PVE) has been investigated for a manganite-based heterojunction composed of a La_(0.7)Ce_(0.3)MnO_3 film and a 0.5 wt % Nb-doped SrTiO_3 substrate. A linear decrease in the photovoltage (V_(oc)) with magnetic fields is observed and the relative variation of V_(oc) [defined as 1- V_(oc)(H)/V_(oc)(0)] is larger than 10% under a field of 0.5 T at a temperature T = 16.5 K. There is a proportional relation between ΔV_(oc) 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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