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Optical and EPR characterization of Er 3+ centers in SrTiO 3 single crystals
Author(s) -
Skvortsov Alexander,
Savchenko Dariya,
Potucek Zdenek,
Jastrabik Lubomir,
Trepakov Vladimir,
Dejneka Alexandr
Publication year - 2014
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201451135
Subject(s) - electron paramagnetic resonance , excited state , impurity , ion , spectroscopy , spectral line , doping , absorption spectroscopy , materials science , energy level splitting , atomic physics , chemistry , analytical chemistry (journal) , crystallography , nuclear magnetic resonance , physics , optics , optoelectronics , organic chemistry , quantum mechanics , astronomy , chromatography
We report on optical absorption and EPR spectroscopy studies of low Er doped (50 ppm) SrTiO 3 single crystals. In the region of 400–650 nm a set of optical intra‐configurational f–f transitions from the 4 I 15/2 ground state to the excited 4 F 9/2 , 4 S 3/2 , 2 H 11/2 , and 2 H 9/2 Stark sublevels of the Er 3+ impurity ions were observed and identified. At T = 2 K the number of registered optical transitions evidences the presence of only one type of Er 3+ centers with non‐cubic symmetry. The system of the energy levels for Er 3+ excited states is determined. The X‐band EPR spectra at 5.2 K revealed the rhombic symmetry of Er 3+ impurity centers. The components of a rhombic g ‐tensor were defined. It was suggested that Er ions substitute Sr ions in A‐sublattice sites.