Abstract
Both transient and persistent photoconductivities (abbreviated to TPC and PPC, respectively) are observed in oxygen-deficient La2∕3Sr1∕3MnO3−δ thin films at low temperatures. The magnitudes of TPC and PPC are 7.6% and 6.08%, respectively, with light density of 4.35mW∕cm2 at 50K. Moreover, a small magnetic field can erase most of PPC effect sharply. The proportion of PPC erased by magnetic field achieves 73% in magnetic field of 0.001T and 97.5% in 0.5T. Electrons trapped by oxygen vacancies are released by the magnetic field and recombine with holes are suggested to be the origin for depression of PPC effect.
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