Optical and EPR characterization of Er.sup.3+./sup. centers in SrTiO.sub.3./sub. single crystals

0435573 - FZÚ 2015 RIV DE eng J - Článek v odborném periodiku
Skvortsov, A. - Savchenko, Dariia - Potůček, Zdeněk - Jastrabík, Lubomír - Trepakov, Vladimír - Dejneka, Alexandr
Optical and EPR characterization of Er³⁺ centers in SrTiO₃ single crystals.
Physica Status Solidi B. Roč. 251, č. 11 (2014), s. 2270-2273. ISSN 0370-1972. E-ISSN 1521-3951
Grant CEP: GA MŠMT(CZ) LM2011029; GA TA ČR TA01010517; GA ČR GAP108/12/1941
Grant ostatní: SAFMAT(XE) CZ.2.16/3.1.00/22132
Institucionální podpora: RVO:68378271
Klíčová slova: electron paramagnetic resonance spectroscopy * optical transmission * rare-earth ions * strontium titanate
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 1.469, rok: 2014

We report on optical absorption and EPR spectroscopy studies of low Er doped (50 ppm) SrTiO3 single crystals. In the region of 400–650 nm a set of optical intra-configurational f–f transitions from the 4I15/2 ground state to the excited 4F9/2, 4S3/2, 2H11/2, and 2H9/2 Stark sublevels of the Er3+ impurity ions were observed and identified. At T=2K the number of registered optical transitions evidences the presence of only one type of Er3+ centers with non-cubic symmetry. The system of the energy levels for Er3+ excited states is determined. The X-band EPR spectra at 5.2 K revealed the rhombic symmetry of Er impurity centers. The components of a rhombic g-tensor were defined. It was suggested that Er ions substitute Sr ions in A-sublattice sites.
Trvalý link: http://hdl.handle.net/11104/0239412