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

Ch. Helm; Ch. Preis; Ch. Walter; J. Keller

doi:10.1103/PhysRevB.62.6002

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

Ch. Helm, Ch. Preis, Ch. Walter, J. Keller

DOI 10.1103/PhysRevB.62.6002 · Physical Review B

T1

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Abstract

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 εphL(ω). 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Tl2Ba2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown