Generalization of the theory of the electron-phonon interaction: Thermodynamic formulation of superconducting- and normal-state properties

1982 ◽  
Vol 26 (3) ◽  
pp. 1186-1207 ◽  
Author(s):  
Warren E. Pickett
Keyword(s):  
Normal State ◽  
Phonon Interaction ◽  
Electron Phonon Interaction ◽  
Normal State Properties

Effects of energy dependence in the electronic density of states on some normal state properties

1983 ◽  
Vol 61 (5) ◽  
pp. 758-783 ◽  
Author(s):  
B. Mitrović ◽  
J. P. Carbotte
Keyword(s):  
Energy Dependence ◽  
Density Of States ◽  
Normal State ◽  
Impurity Scattering ◽  
Eliashberg Equations ◽  
Electronic Density ◽  
Electronic Density Of States ◽  
Electron Phonon Interaction ◽  
Normal State Properties ◽  
Energy Equations

We study the effects of energy dependence in the electronic density of states (EDOS) on the electron quasiparticle properties in the normal state. The Migdal–Eliashberg equations generalized to include a nonconstant EDOS are derived in the isotropic approximation. By numerical solution of the electron self-energy equations in the normal state, we assess the effect of the interplay of the energy dependence in the EDOS, the electron–phonon interaction, and/or elastic impurity scattering on the electron quasiparticle properties. Self-consistency requirements are fully discussed.

scholarly journals High-Tc Superconductors: Evidence on the Electron?Phonon Interaction from Transport Measurements

1988 ◽  
Vol 41 (4) ◽  
pp. 597 ◽  
Author(s):  
AB Kaiser ◽  
C Uher
Keyword(s):  
Thermal Conductivity ◽  
Transition Temperature ◽  
Transport Properties ◽  
Hall Coefficient ◽  
Electronic Transport ◽  
Normal State ◽  
High Tc Superconductors ◽  
Phonon Interaction ◽  
High Tc ◽  
Electron Phonon Interaction

We discuss the interpretation of measurements of thermal conductivity, thermopower, Hall coefficient, resistivity and mapetorcsistance in hiJh-temperaturc superconductors. The thermal conductivity of YBa2 Cu3 07 shows an increase below the transition temperature 7;:, demonstrating the importance of the electron-phonon interaction in reducing the phonon current in the normal state. Many features of resistivity and thermopower can be interpreted in terms of conventional metallic models, although morc exotic interpretations have been proposed. We show how measurements on morc disordered samples should help resolve controversy regarding the interpretation of the electronic transport properties.

Far-Infrared Properties of ab plane oriented YBa2Cu3O7-δ

1987 ◽  
Vol 99 ◽  
Author(s):  
D. A. Bonn ◽  
A. H. O'Reilly ◽  
J. E. Greedan ◽  
C. V. Stager ◽  
T. Timusk ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Normal State ◽  
Superconducting State ◽  
Plasma Frequency ◽  
Far Infrared ◽  
Superconducting Transition ◽  
Phonon Interaction ◽  
Electron Phonon Interaction ◽  
Oriented Samples ◽  
Absolute Reflectance

ABSTRACTPolycrystalline samples of YBa2Cu2O7-δ with a variety of surface treatments show differences in absolute reflectance and width of phonon lines. Samples that are not polished and are measured immediately after annealing have largely grains with the c axis normal to the surface. Such oriented samples show a gap-like depression of conductivity in the far infrared that sets in below the superconducting transition temperature but no true gap. Phonon lines at 195 cm−1 and at 155 cm−1 narrow in the superconducting state, in analogy with the effect of the electron phonon interaction in BCS superconductors. In the normal state the background conductivity is Drude like with a plasma frequency of 0.75 eV and a relaxation rate of 200 cm−1. The extrapolated far-infrared conductivity agrees with the measured dc conductivity.

scholarly journals Absence of evidence of superconductivity in sulfur hydride in optical reflectance experiments

2021 ◽  
Author(s):  
J. E. Hirsch ◽  
F. Marsiglio
Keyword(s):  
High Temperature ◽  
Normal State ◽  
High Temperature Superconductor ◽  
Measured Data ◽  
Superconducting Transition ◽  
Phonon Interaction ◽  
Optical Reflectance ◽  
Electron Phonon Interaction ◽  
Reflectance Measurements

Abstract Capitani and coworkers reported that infrared optical reflectance measurements provided evidence for a superconducting transition in sulfur hydride under 150 GPa pressure, and that the transition is driven by the electron-phonon interaction. Here we argue that the measured data did not provide evidence that the system undergoes a transition to a superconducting state, nor do the data support any role of phonons in driving a transition. Rather, the data are consistent with the system remaining in the normal state down to temperature 50K, the lowest temperature measured in the experiment. This calls into further question the generally accepted view that sulfur hydride under pressure is a high temperature superconductor.

The simulation of the electron-phonon interaction in silicon

2018 ◽  
Vol 30 (12) ◽  
pp. 3-16
Author(s):  
A. Berezin ◽  
◽  
Yu. Volkov ◽  
M. Markov ◽  
I. Tarakanov ◽  
...  
Keyword(s):  
Phonon Interaction ◽  
Electron Phonon Interaction
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