mriselMagnetic Resonance in SolidsMagnetic Resonance in Solids2072-5981Kazan Federal Universitymrisel-174Research ArticleСтатьиPhotoinduced EPR in KTa0.988Nb0.012O3 crystalsGubaevA. I.

Klingelbergstr. 50-70, Basel 4056

RodionovA. A.

Kremlevskaya, 18, Kazan 420008

SalakhovM. Kh.

Kremlevskaya, 18, Kazan 420008

SubachevaI. N.

Kremlevskaya, 18, Kazan 420008

subirina@gmail.comSyrnikovP. P.

St.-Petersburg 194021

TrepakovV. A.

St.-Petersburg 194021; 182 21 Prague 8, Czech Republic

YusupovR. V.

Kremlevskaya, 18, Kazan 420008

Basel UniversitySwitzerlandKazan State UniversityRussian FederationA. F. Ioffe Physical-Technical InstituteRussian FederationA. F. Ioffe Physical-Technical Institute; Institute of Physics, ASCRRussian Federation201020012024121711Copyright © Gubaev A.I., Rodionov A.A., Salakhov M.K., Subacheva I.N., Syrnikov P.P., Trepakov V.A., Yusupov R.V., 20242024Gubaev A.I., Rodionov A.A., Salakhov M.K., Subacheva I.N., Syrnikov P.P., Trepakov V.A., Yusupov R.V.Gubaev A.I., Rodionov A.A., Salakhov M.K., Subacheva I.N., Syrnikov P.P., Trepakov V.A., Yusupov R.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.mrsej.ru/jour/article/view/174

We report the first experimental observation of the photoinduced EPR spectra in KTa1-xNbxO3 crystals (x = 0.012). The signal has two components: nearly isotropic with geff = 2 and strongly anisotropic one. Isotropic signal originates most probably from single localized photo-carriers - electrons or holes. Anisotropic spectrum is observed below 10 K and reveals a set of characteristic properties. It originates from the axial centers with axes coinciding with the C4 axes of the crystal. Effective g-factor values are gparallel = 2.106(3) and gnormal < 0.8. Angle dependencies of the intensity and the width of the anisotropic signal as well as the resonance field can qualitatively be explained within the simple J = 1 model. The observed anisotropic photoinduced EPR spectrum is tentatively assigned to excitons or bipolarons.

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The authors declare that there are no conflicts of interest present.