Erasure of photoconductivity by magnetic field in oxygen-deficient La2∕3Sr1∕3MnO3−δ thin films
Erasure of photoconductivity by magnetic field in oxygen-deficient La2∕3Sr1∕3MnO3−δ thin films
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DOI：
10.1063/1.2337285
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发表时间：
2006-08
影响因子：
4
通讯作者：
Z. Sheng;Y. Sun;J. Dai;X. B. Zhu;Wen-li Song
中科院分区：
文献类型：
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作者：
Z. Sheng;Y. Sun;J. Dai;X. B. Zhu;Wen-li Song
在低温下，在缺氧的La 2 scin 3Sr 1 scin 3 MnO 3 −δ薄膜中观察到瞬态和持续光电导（分别缩写为TPC和PPC）。在50 K时，光密度为4.35mW·cm ~ 2，TPC和PPC的幅度分别为7.6%和6.08%。此外，一个小的磁场可以消除大部分的PPC效应急剧。在0.001T磁场下，PPC被磁场擦除的比例达到73%，在0.5T磁场下，PPC被磁场擦除的比例达到97.5%。被氧空位俘获的电子被磁场释放并与空穴复合是PPC效应降低的原因。
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.