Details

Autor(en) / Beteiligte

• La Mattina, F.
• Bednorz, J. G.
• Alvarado, S. F.
• Shengelaya, A.
• Keller, H.

Titel

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

Ist Teil von

• Applied physics letters, 2008-07, Vol.93 (2)

Erscheinungsjahr

2008

Link zum Volltext

Quelle

美国小型学会期刊集（AIP Scitation平台）

Beschreibungen/Notizen

• 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.