1. Detection of charge transfer processes in Cr-doped SrTiO3 single crystals
- Author
-
La Mattina, F, Bednorz, J G, Alvarado, S F, Shengelaya, A, Keller, H, La Mattina, F, Bednorz, J G, Alvarado, S F, Shengelaya, A, and Keller, H
- Abstract
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. ©2008 American Institute of Physics
- Published
- 2008