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.
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页数：3
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