PHOTOINDUCED IR ABSORPTION IN AMnO3 AS A FUNCTION OF THE A SITE IONIC SPECIES

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3590-3595 ◽  
Author(s):  
T. MERTELJ ◽  
M. HROVAT ◽  
D. KUSCER ◽  
D. MIHAILOVIC
Keyword(s):  
Absorption Spectrum ◽  
Absorption Spectra ◽  
Ionic Species ◽  
Ir Absorption ◽  
Coupling Constant ◽  
Phonon Coupling ◽  
Photoinduced Absorption ◽  
Polaron Hopping ◽  
Electron Phonon Coupling ◽  
A Site

A comparison of photoinduced absorption spectra in AMnO 3 with A = La 3+, Nd 3+, Ca 2+ is presented. The spectra are analyzed in the framework of photon assisted polaron hopping. In contrast to LaMnO 3 and NdMnO 3 the photoinduced absorption spectrum of CaMnO 3 shows distinct contributions from photoexcited holes and electrons. Both contributions are identified, and our results imply that magnitude of electron-phonon coupling constant for electrons in Mn eg orbitals in CaMnO 3 is significantly smaller than in LaMnO 3.

scholarly journals Estimation of electron-phonon coupling constant in Ba1-xKxBiO3

2020 ◽  
Vol 1686 ◽  
pp. 012049
Author(s):  
Alexander E Lukyanov ◽  
Vyacheslav D Neverov ◽  
Andrey V Krasavin ◽  
Alexey P Menushenkov
Keyword(s):  
Coupling Constant ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

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...

scholarly journals Determination of the electron–phonon coupling constant in tungsten

2014 ◽  
Vol 105 (2) ◽  
pp. 023112 ◽  
Author(s):  
Szymon L. Daraszewicz ◽  
Yvelin Giret ◽  
Hiroshi Tanimura ◽  
Dorothy M. Duffy ◽  
Alexander L. Shluger ◽  
...  
Keyword(s):  
Coupling Constant ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

THEORETICAL ASPECTS OF THE FIELD INDUCED SUPERCONDUCTIVITY IN POLYACENES AND C60

2002 ◽  
Vol 16 (11n12) ◽  
pp. 1547-1551
Author(s):  
S.-L. DRECHSLER ◽  
G. PAASCH ◽  
J. MÁLEK ◽  
S. V. SHULGA ◽  
H. ESCHRIG ◽  
...  
Keyword(s):  
Tight Binding ◽  
Band Structure Calculation ◽  
Full Potential ◽  
Coupling Constant ◽  
Phonon Coupling ◽  
Critical Temperatures ◽  
Binding Model ◽  
Electron Phonon Coupling ◽  
Strong Coulomb ◽  
Experimental Values

The electronic structure and the superconductivity in field-doped polyacenes are considered. Within a modified Thomas–Fermi approach for typical experimental values of the surface charge density the injected charge is confined to a monolayer. The electron–phonon coupling constant for internal modes λintra is estimated using the work of Devos and Lanoo (Ref. 4) and the density of states N(0) estimated from a 2D tight-binding model derived from a full potential LDA band structure calculation for bulk anthracene. The empirical values of the Coulomb pseudopotentials are significantly enhanced. The strong Coulomb interaction is considered as a key quantity which determines the large differences in the critical temperatures achieved for n-doped polyacenes and C 60.

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