Electron-phonon Coupling in the 4T2g Excited Electron State of Cs2GeF6:Mn4+

2005 ◽  
Vol 60 (1-2) ◽  
pp. 54-60
Author(s):  
N. M. Avram ◽  
M. G. Brika
Keyword(s):  
Energy Surface ◽  
Normal Modes ◽  
Coupling Constants ◽  
Octahedral Complex ◽  
Phonon Coupling ◽  
Orbit Splitting ◽  
Spin Orbit Splitting ◽  
Electron Phonon Coupling ◽  
Jahn Teller ◽  
Jahn Teller Effect

In the present paper we report on an analysis of the fine structure of the first excited quartet 4T2g of Mn4+ ions which occupy the octahedral site in the Cs2GeF6 host crystal. The dynamic 4T2g⊗(eg+t2g) Jahn-Teller effect is considered in details, including the Ham effect of the reduction of the spin-orbit splitting and displacements of the ligands due to the combined effect of the a1g and eg normal modes of the [MnF6]2− octahedral complex. The electron-phonon coupling constants are evaluated using the experimental spectroscopic data. The value of the Jahn-Teller stabilization energy EJT = 438 cm−1 for the considered complex is estimated from both the Ham effect and the potential energy surface of the 4T2g excited state.

scholarly journals Photoemission Spectra ofC60−: Electron-Phonon Coupling, Jahn-Teller Effect, and Superconductivity in the Fullerides

1995 ◽  
Vol 74 (10) ◽  
pp. 1875-1878 ◽  
Author(s):  
O. Gunnarsson ◽  
H. Handschuh ◽  
P. S. Bechthold ◽  
B. Kessler ◽  
G. Ganteför ◽  
...  
Keyword(s):  
Teller Effect ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Jahn Teller ◽  
Jahn Teller Effect

Electron–phonon coupling and Jahn–Teller effect in KMgF3:Cr3+

2004 ◽  
Vol 241 (13) ◽  
pp. 2982-2993 ◽  
Author(s):  
M. G. Brik ◽  
N. M. Avram ◽  
I. Tanaka
Keyword(s):  
Teller Effect ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Jahn Teller ◽  
Jahn Teller Effect

Lie Groups and the Jahn–Teller Effect

1974 ◽  
Vol 52 (11) ◽  
pp. 999-1044 ◽  
Author(s):  
B. R. Judd
Keyword(s):  
Lie Groups ◽  
Nuclear Physics ◽  
Angular Frequency ◽  
Teller Effect ◽  
Octahedral Complex ◽  
Noncompact Group ◽  
Five Dimensions ◽  
Branching Rules ◽  
Jahn Teller ◽  
Jahn Teller Effect

After an introduction to the classic theory of the Jahn–Teller effect for octahedral complexes, an account is given of Lie groups and their relevance to the F+ center in CaO. The coincidence of the three-fold and two-fold vibrational modes (both of angular frequency ω) leads to a study of U5 and R5, the unitary and rotation groups in five dimensions. The language of second quantization is used to describe the weight spaces and branching rules. Pairs of annihilation and creation operators for phonons are coupled to zero angular momentum and used as the generators of the noncompact group O(2, 1). This facilitates the evaluation of matrix elements of V, the interaction that couples the oscillations of the octahedral complex to the electron in its interior. Glauber states are used near the strong Jahn–Teller limit, corresponding to [Formula: see text]. The possible extension of the analysis to incorporate the breathing mode is outlined. Correspondences with problems in nuclear physics are mentioned.

The rich physics of A-site-ordered quadruple perovskite manganites AMn7O12

2021 ◽  
Author(s):  
Alexei A. Belik ◽  
Roger D Johnson ◽  
Dmitry Khalyavin
Keyword(s):  
Perovskite Structure ◽  
Double Exchange ◽  
Perovskite Manganites ◽  
Phonon Coupling ◽  
Electron Phonon Coupling ◽  
Jahn Teller ◽  
The Rich ◽  
A Site ◽  
Small Polarons

Perovskite-structure AMnO3 manganites played an important role in the development of numerous physical concepts such as double exchange, small polarons, electron-phonon coupling, and Jahn−Teller effects, and they host a variety...

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