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Stress‐Induced Alignment of Jahn‐Teller Centres Cr 2+ in ZnSe Crystals. Optical Study
Author(s) -
Ryskin A. I.,
Vasilev A. V.,
Natadze A. L.
Publication year - 1979
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.2220930202
Subject(s) - impurity , jahn–teller effect , materials science , condensed matter physics , ion , phonon , crystallography , spectral line , stress (linguistics) , absorption spectroscopy , crystal twinning , optics , chemistry , physics , microstructure , linguistics , philosophy , organic chemistry , astronomy
Abstract Uniaxial compression of ZnSe–Cr crystals along the fourth‐order axis results in shift and splitting of the zero‐phonon lines of the absorption band, connected with the 5 B̂ 2 ( 5 T 2 ) → ( 5 Â 1 + 5 B̂ 1 ) ( 5 E) transition of the impurity Cr 2+ ions, and in dichroism, which is caused by the reorientation of the Jahn‐Teller centres Cr 2+ along the stress direction. Spectra of stressed crystals are calculated on the base of the exchange‐charge model. In imperfect (twinned) ZnSe crystals two types of Cr 2+ centres are observed. These centres are identified as Cr 2+ ions in the interlayers of a twin structure.