Detection of charge transfer processes in Cr-doped SrTiO3 single crystals

被引：26

作者：

La Mattina, F. ^{[1
,2
]}

Bednorz, J. G. ^{[2
]}

Alvarado, F. ^{[2
]}

Shengelaya, A. ^{[3
]}

Keller, H. ^{[1
]}

机构：

[1] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland

[2] IBM Res Corp, Zurich Res Lab, CH-8803 Ruschlikon, Switzerland

[3] Tbilisi State Univ, Inst Phys, GE-0128 Tbilisi, Georgia

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 02期

关键词：

D O I：

10.1063/1.2959059

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

An insulator-to-metal transition is observed in Cr-doped SrTiO3 single crystals upon extended exposure to a high electric field, namely, electroconditioning (EC). Electron paramagnetic resonance (EPR) and transport measurements under laser irradiation show anticorrelation between the Cr3+ EPR signal and the electrical current. This proves that the Cr3+ ions are responsible for the photocurrent that initiates the EC process. We observe the presence of Cr3+/Cr4+ mixed valencies in the bulk in the conducting state. The EPR characterization of the spectra in the conducting state excludes the possibility of a Cr3+-oxygen vacancy complex in the bulk as a result of the EC. (C) 2008 American Institute of Physics.

引用

页数：3

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