Photocarrier injection effect on double exchange ferromagnetism in (La, Sr)MnO3/SrTiO3 heterostructure

被引：79

作者：

Katsu, H ^{[1
]}

Tanaka, H ^{[1
]}

Kawai, T ^{[1
]}

机构：

[1] Osaka Univ, Inst Sci & Ind Res, Osaka 5670047, Japan

来源：

APPLIED PHYSICS LETTERS | 2000年 / 76卷 / 22期

关键词：

D O I：

10.1063/1.126595

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have fabricated a (La1-xSrx) MnO3/SrTiO3 heterostructure and measured the temperature dependence of magnetization and resistivity under white light irradiation. We found that increased resistivity and a decrease of the metal-to-insulator transition temperature by 10 K occur under illumination of light at a wavelength below 400 nm. In particular, an additional photoinduced metal-semiconductor transition is observed below 100 K with decreased magnetization. This behavior can be explained by considering that the hole concentration in the (La1-xSrx) MnO3 layer decreases owing to electron injection following the photoexcitation of SrTiO3. We also confirmed electron injection along a perpendicular direction to the heterostructure using current-voltage measurement. (C) 2000 American Institute of Physics. [S0003-6951(00)00322-3].

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页码：3245 / 3247

页数：3

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