Influence of long-range and strong correlation effects on the electron-phonon coupling in high-T c oxides

1994 ◽  
Vol 7 (3) ◽  
pp. 537-541 ◽  
Author(s):  
Roland Zeyher
Keyword(s):  
Long Range ◽  
Strong Correlation ◽  
Correlation Effects ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

Long-Range Electron-Phonon Coupling at Metal Surfaces

1984 ◽  
Vol 52 (23) ◽  
pp. 2073-2076 ◽  
Author(s):  
S. Andersson ◽  
B. N. J. Persson ◽  
M. Persson ◽  
N. D. Lang
Keyword(s):  
Long Range ◽  
Metal Surfaces ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

Effective electron-phonon coupling and polaronic transition in the presence of strong correlation

2006 ◽  
Vol 73 (8) ◽  
Author(s):  
Paolo Barone ◽  
Roberto Raimondi ◽  
Massimo Capone ◽  
Claudio Castellani
Keyword(s):  
Strong Correlation ◽  
Phonon Coupling ◽  
Effective Electron ◽  
Electron Phonon Coupling

ELECTRONIC CORRELATIONS AND ELECTRON-PHONON COUPLING IN C60

1993 ◽  
Vol 07 (15) ◽  
pp. 2859-2884 ◽  
Author(s):  
MARKKU I. SALKOLA ◽  
SUDIP CHAKRAVARTY ◽  
STEVEN A. KIVELSON
Keyword(s):  
Single Molecule ◽  
Phonon Spectrum ◽  
Correlation Effects ◽  
Phonon Coupling ◽  
Teller Distortion ◽  
Electron Phonon Coupling ◽  
Jahn Teller ◽  
Infrared Intensities ◽  
Doubly Charged ◽  
Jahn Teller Distortion

We study a model of a single molecule of C 60 to obtain an understanding of the interplay between the electron-electron and electron-phonon interactions in these molecules. In particular, we calculate the intramolecular phonon spectrum, infrared intensities, and the Raman intensities. We also find that when correlation effects are sufficiently strong, the Jahn-Teller distortion of the doubly charged molecule is suppressed. Thus, if the correlation effects are strong, the superconductivity in doped C 60 cannot be mediated by intra-molecular Jahn-Teller phonons.

scholarly journals Polaron Dissociation at the Insulator-to-Metal Transition

1997 ◽  
Vol 11 (30) ◽  
pp. 1303-1312 ◽  
Author(s):  
P. Quémerais ◽  
S. Fratini
Keyword(s):  
Phase Diagram ◽  
Strong Coupling ◽  
Long Range ◽  
Liquid State ◽  
Large Mass ◽  
Critical Value ◽  
The Other ◽  
Phonon Coupling ◽  
Coulomb Interactions ◽  
Electron Phonon Coupling

Considering the long range Coulomb interactions between large polarons in dielectrics, we propose a model for their crystallization when no bipolarons are formed. As the density increases, the melting is examined at T=0 K. One possibility is the delocalization towards a liquid state of polarons. However, we show that this cannot happen if the electron-phonon coupling is larger than some critical value. The other competing mechanism is the dissociation of the polarons themselves, favored owing to their large mass at strong coupling. Finally, we propose a phase diagram for the insulator-to-metal transition as a function of the density and electron–phonon coupling.

scholarly journals Long-range transfer of electron–phonon coupling in oxide superlattices

2012 ◽  
Vol 11 (8) ◽  
pp. 675-681 ◽  
Author(s):  
N. Driza ◽  
S. Blanco-Canosa ◽  
M. Bakr ◽  
S. Soltan ◽  
M. Khalid ◽  
...  
Keyword(s):  
Long Range ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

Screening of the Electron-Phonon Coupling in Nb-doped SrTiO3

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3525-3527 ◽  
Author(s):  
T. Jarlborg
Keyword(s):  
Long Range ◽  
Phonon Coupling ◽  
Virtual Crystal Approximation ◽  
Electronic Part ◽  
Electron Phonon Coupling ◽  
Lmto Method ◽  
Nb Doping ◽  
Range Part

The electronic part of the electron-phonon coupling, λ, in pure and Nb-doped SrTiO 3 has been calculated using the LMTO method. Supercells and the virtual crystal approximation has been used to treat the cases with dilute Nb-doping. It is found that the long-range part of the coupling is only weakly screened for low doping, when the material is close to be insulating. This makes the low-q part of λ large and can explain the appearance of superconductivity for low Nb concentration.

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