Theory for the coupling between longitudinal phonons and intrinsic Josephson oscillations in layered superconductors

Journal Article · Fri Sep 01 00:00:00 EDT 2000 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.62.6002· OSTI ID:20217479

Helm, Ch ^[1]; Preis, Ch ^[1]; Walter, Ch ^[1]; Keller, J ^[1]

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1. Institut fuer Theoretische Physik, Universitaet Regensburg, D-93040 Regensburg, (Germany)

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 {epsilon}{sub ph}{sup L}({omega}). 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. (c) 2000 The American Physical Society.

• OSTI ID: 20217479
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 62, Issue 9; Other Information: PBD: 1 Sep 2000; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
PHONONS
JOSEPHSON EFFECT
LAYERS
SUPERCONDUCTING FILMS
DIELECTRIC TENSOR
COUPLING
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTORS
HIGH-TC SUPERCONDUCTORS
DAMPING
THEORETICAL DATA