Physics – Condensed Matter – Superconductivity
Scientific paper
1999-09-22
Physics
Condensed Matter
Superconductivity
submitted to Phys. Rev. B, corrections following referee report
Scientific paper
10.1103/PhysRevB.62.6002
In this publication a microscopic theory for the coupling of intrinsic Josephson oscillations in layered superconductors with longitudinal c-axis-phonons is developed. It is shown that the influence of lattice vibrations on the c-axis transport can be fully described by introducing an effective longitudinal dielectric function. Resonances in the I-V-characteristic appear at van Hove singularities of both acoustical and optical longitudinal phonon branches. This provides a natural explanation of the recently discovered subgap structures in the I-V-characteristic of highly anisotropic cuprate superconductors. The effect of the phonon dispersion on the damping of these resonances and the coupling of Josephson oscillations in different resistive junctions due to phonons are discussed in detail.
Helm Ch.
Keller Julien
Preis Ch.
Walter Christian
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