Physics – Condensed Matter – Superconductivity
Scientific paper
2000-01-11
Physica C 341-348 (2000), 1543
Physics
Condensed Matter
Superconductivity
4 pages, 3 figures, 1 table, espcrc2.sty, invited contribution to "Materials and Mechanisms of Superconductivity and High Temp
Scientific paper
10.1016/S0921-4534(00)01329-0
A microscopic theory for the coupling of intrinsic Josephson oscillations and dispersive phonon branches in layered superconductors is developed. Thereby the effect of phonons on the electronic c-axis transport enters through an effective longitudinal dielectric function. This coupling provides an explanation of recently observed subgap resonances in the $I_{dc}$-$V_{dc}$- curve of anisotropic cuprate superconductors forming a stack of short Josephson junctions. Due to the finite dispersion these resonances can appear at van-Hove-singularities of both optical and acoustical phonon branches, explaining low-voltage structures in the I-V-characteristic, which are not understood in phonon models without dispersion. In long junctions the dispersion of collective electron-phonon modes parallel to the layers is investigated.
Helm Ch.
Keller Julien
Preis Ch.
Schmalzl Karin
Walter Ch.
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