Photoinduced Effects in EPR Spectra of Copper Doped Potassium Tantalate
A. G. BadalyanRussian Academy of SciencesCarlo B. AzzoniPavia UniversityPietro GalinettoPavia UniversityMaria Cristina MozzatiPavia UniversityL. Jastrabı́kAcademy of Sciences of Czech RepublicJan RosaAcademy of Sciences of Czech RepublicM. HrabovskýAcademy of Sciences of Czech RepublicП. П. СырниковIoffe Physicotechnical Institute RASВ. А. ТрепаковAcademy of Sciences of Czech Republic
ABI
Аннотация
The UV illumination effects in KTaO3 single crystals with Cu2+ impurity ions have been studied by electron paramagnetic resonance method. Single crystals both “as-grown” and thermally treated in oxygen atmosphere were investigated. It was found that the EPR signal of the Cu2+ centers decreases in the “as-grown” crystals during UV-irradiation at 365 nm, in the wholeinvestigated temperature range (3.7- 300 K). On the contrary, for the oxidized specimens a sizeable increase of the EPR signal of Cu2+ centers (except the signal from exchange coupled pair centers) is observed under UV illumination in some temperature regions.
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