Oxygen-vacancy donor-electron center in Y.sub.3./sub.Al.sub.5./sub.O.sub.12./sub. garnet crystals: Electron paramagnetic resonance and dielectric spectroscopy study

0533017 - FZÚ 2021 RIV US eng J - Journal Article
Laguta, Valentyn - Buryi, Maksym - Arhipov, P. - Sidletskiy, O. - Laguta, O. - Brik, M.G. - Nikl, Martin
Oxygen-vacancy donor-electron center in Y₃Al₅O₁₂ garnet crystals: Electron paramagnetic resonance and dielectric spectroscopy study.
Physical Review B. Roč. 101, č. 2 (2020), s. 1-10, č. článku 024106. ISSN 2469-9950. E-ISSN 2469-9969
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA MŠMT EF16_013/0001406; GA MŠMT(CZ) LO1409; GA ČR GA17-09933S
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760; OP VVV - SAFMAT(XE) CZ.02.1.01/0.0/0.0/16_013/0001406
Institutional support: RVO:68378271
Keywords : oxygen vacancy * donor electron * F+ center * garnet crystals * EPR
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 4.036, year: 2020
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevB.101.024106

The F+ center consisting of an electron trapped at the oxygen vacancy (V_O) was investigated in the oxygen deficient Y3Al5O12 (YAG) garnet crystals by electron paramagnetic resonance (EPR) techniques. The measurements were performed in the wide temperature interval 5450 K and the frequency range 9.4350 GHz using both the conventional continuous-wave and pulse EPR experiments. The pulse electron-nuclear double resonance was applied to resolve the hyperfine interaction of the trapped electron with surrounding nuclei. A model of the F+ center in YAG is proposed on the basis of the obtained experimental data. The model assumes localization of an electron within oxygen vacancy space at T < 50 K, like in MgO, and its further behavior with temperature increase is similar to that of the donor electron in a semiconducting material.

Permanent Link: http://hdl.handle.net/11104/0311519