Estimation of the Electron–Phonon Coupling Constants for Graphene and Metallic and Nonmetallic Substrates

2018 ◽  
Vol 60 (4) ◽  
pp. 812-820 ◽  
Author(s):  
S. Yu. Davydov
Keyword(s):  
Coupling Constants ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

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.

Influence of disorder strength on the superconducting mechanism of MgB2

2021 ◽  
Author(s):  
Jung Min Lee ◽  
Soon-Gil Jung ◽  
Younseok Han ◽  
Tae-Ho Park ◽  
Jae Kyung Jang ◽  
...  
Keyword(s):  
Thin Films ◽  
Ion Irradiation ◽  
Electronic System ◽  
Coupling Constants ◽  
Disorder Strength ◽  
Coupling Constant ◽  
Phonon Coupling ◽  
Normal State Resistivity ◽  
Electron Phonon Coupling ◽  
Effect Of Disorder

Abstract We investigate the effect of disorder on the superconducting mechanism of MgB2 thin films using low-energy ion irradiation. The c-axis lattice constant and T c of MgB2 thin films change systematically as the magnitude of disorder, which corresponds to the value of average displacements per atom (dpaavg ), increases. Here, dpaavg is controlled by the amount of irradiated ions. The dpaavg dependence of the electron-phonon coupling constants (λ) is estimated using the McMillan equation. For dpaavg ≤ 0.049, λ is linearly proportional to dpaavg . On the other hand, for dpaavg > 0.049, the T c of the disordered MgB2 deviates from the linear fitting curve, and insulating behavior is observed in the normal state resistivity. These results indicate that the superconducting mechanism of MgB2 can be changed by the electronic system caused by disorder strength affecting the electron-phonon coupling constant λ.

Effect of Solvent Polarity on The Electron-phonon Coupling Constants of β-carotene

2013 ◽  
Vol 34 (10) ◽  
pp. 1373-1379
Author(s):  
徐胜楠 XU Sheng-nan ◽  
孙美娇 SUN Mei-jiao ◽  
孙尚 SUN Shang ◽  
刘天元 LIU Tian-yuan ◽  
朱坤博 ZHU Kun-bo ◽  
...  
Keyword(s):  
Solvent Polarity ◽  
Coupling Constants ◽  
Phonon Coupling ◽  
Effect Of Solvent ◽  
Electron Phonon Coupling ◽  
Β Carotene

scholarly journals Measuring the Electron–Phonon Interaction in Two-Dimensional Superconductors with He-Atom Scattering

2020 ◽  
Vol 5 (4) ◽  
pp. 79
Author(s):  
Giorgio Benedek ◽  
Joseph R. Manson ◽  
Salvador Miret-Artés ◽  
Adrian Ruckhofer ◽  
Wolfgang E. Ernst ◽  
...  
Keyword(s):  
Enhancement Factor ◽  
Coupling Constants ◽  
Phonon Coupling ◽  
Phonon Interaction ◽  
Helium Atom Scattering ◽  
Electron Phonon Interaction ◽  
Atom Scattering ◽  
Electron Phonon Coupling ◽  
Layered Transition Metal ◽  
Mass Enhancement

Helium-atom scattering (HAS) spectroscopy from conducting surfaces has been shown to provide direct information on the electron–phonon interaction, more specifically the mass-enhancement factor λ from the temperature dependence of the Debye–Waller exponent, and the mode-selected electron–phonon coupling constants λQν from the inelastic HAS intensities from individual surface phonons. The recent applications of the method to superconducting ultra-thin films, quasi-1D high-index surfaces, and layered transition-metal and topological pnictogen chalcogenides are briefly reviewed.

Superconducting and transport electron-phonon coupling constants in YBa2Cu3O7: effect of the interband anisotropy

1993 ◽  
Vol 209 (1-3) ◽  
pp. 125-128 ◽  
Author(s):  
I.I. Mazin ◽  
A.I. Liechtenstein ◽  
C.O. Rodriguez ◽  
O. Jepsen ◽  
O.K. Andersen
Keyword(s):  
Coupling Constants ◽  
Phonon Coupling ◽  
Electron Phonon Coupling
Sign in / Sign up

Export Citation Format

Share Document