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Internal Cobalt States and Charge Transfer Transitions in ZnTe:Co Crystals under Pressure
Author(s) -
Griebl E.,
Kronschnabl A.,
Krenzer M.,
Müller P.,
Gebhardt W.
Publication year - 1999
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/(sici)1521-3951(199901)211:1<117::aid-pssb117>3.0.co;2-7
Subject(s) - hydrostatic pressure , absorption edge , acceptor , valence (chemistry) , impurity , crystal (programming language) , materials science , cobalt , condensed matter physics , chemistry , atomic physics , band gap , inorganic chemistry , physics , computer science , organic chemistry , thermodynamics , programming language
The transmission of ZnTe:Co was measured at 2 K under hydrostatic pressure up to 8 GPa. Two kinds of optical transitions were investigated: (i) Internal 3d 7 transitions between crystal field levels of Co 2+ in the tetrahedral field of the ZnTe lattice. The pressure dependence of the crystal field parameter Dq and of the Racah parameter B was determined. (ii) A charge transfer absorption edge, which is caused by an electron transfer from the valence band of ZnTe to the Co 3d 7 states. The acceptor state of the impurity was found to be an absolute energy reference, which makes a determination of the hydrostatic deformation potential a v of the valence band possible.