Weak electron-phonon interaction and strong phonon features in a-b-plane optical conductivity of high-Tc superconductors

We show that the model of charge-transfer fluctuation with LO phonons can unify the interpretation of the infrared features and the phonon softening at about 55 meV measured by neutron scattering experiments in high temperature superconductors. Based upon this model we demonstrate that reflectivity ratio of superconducting state to normal state is strongly modified as a result of strong electron-phonon interaction which is different from Holstein mechanism. A broad peak in the ratio reflectivity develops around the peak position of different neutron phonon density of states. This peak becomes stronger and shifts to a higher frequency as the coupling increases at lower temperatures. This situation complicates the interpretation of the ratio reflectivity peak as the superconducting gap.

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Electronic Structure, Lattice Dynamics, and Electron-Phonon Interaction in High Tc Superconductors

High-Temperature Superconductivity ◽

10.1007/978-1-4615-3338-2_2 ◽

1991 ◽

pp. 7-18

Author(s):

R. E. Cohen ◽

H. Krakauer ◽

W. E. Pickett

Keyword(s):

Electronic Structure ◽

Lattice Dynamics ◽

High Tc Superconductors ◽

Phonon Interaction ◽

High Tc ◽

Electron Phonon Interaction

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Phonons and electron-phonon interaction in high Tc superconductors

Journal of Molecular Structure ◽

10.1016/0022-2860(93)80104-4 ◽

1993 ◽

Vol 292 ◽

pp. 255-267 ◽

Cited By ~ 1

Author(s):

M. Cardona

Keyword(s):

High Tc Superconductors ◽

Phonon Interaction ◽

High Tc ◽

Electron Phonon Interaction

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Phonons, Electrons, and Electron-Phonon Interaction: Semiconductors and High-Tc Superconductors

NATO Science Series: B: - Ultrafast Dynamics of Quantum Systems ◽

10.1007/0-306-47080-2_7 ◽

2006 ◽

pp. 257-293 ◽

Cited By ~ 2

Author(s):

Manuel Cardona

Keyword(s):

High Tc Superconductors ◽

Phonon Interaction ◽

High Tc ◽

Electron Phonon Interaction

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

Australian Journal of Physics ◽

10.1071/ph880597 ◽

1988 ◽

Vol 41 (4) ◽

pp. 597 ◽

Cited By ~ 12

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.

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