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Stress study of the Jahn‐Teller effect in the 4 T 2 , state of Cr 3+ in α‐Al 2 O 3
Author(s) -
Duval E.,
Louat R.,
Lacroix R.
Publication year - 1972
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.2220500224
Subject(s) - jahn–teller effect , excited state , wave function , hamiltonian (control theory) , atomic physics , molecular vibration , vibronic coupling , trigonal crystal system , physics , potential energy , chemistry , condensed matter physics , quantum mechanics , crystallography , ion , crystal structure , molecule , mathematics , mathematical optimization
The vibronic wavefunctions of the 4 T 2 , relaxed excited state of Cr 3+ in α‐Al 2 O 3 are determined when there are a Jahn‐Teller coupling with the E g ‐mode and a trigonal potential which cannot be treated as a perturbation with respect to the electron‐vibration interaction. The interaction Hamiltonian with a uniaxial stress, parallel or perpendicular to the C 3 ,‐axis, is obtained. The experimental results are interpreted by the existence of a Jahn‐Teller effect with the E g ‐mode. Choosing 200 cm −1 for the vibrational quantum energy, the Jahn‐Teller energy is calculated from the experimental data.