Coupling between phonons and intrinsic Josephson oscillations in cuprate superconductors

Details Coupling between phonons and intrinsic Josephson oscillations in cuprate superconductors Coupling between phonons and intrinsic Josephson oscillations in cuprate superconductors

1997-01-08

arxiv.org/abs/cond-mat/9701049v2

Phys. Rev. Lett. 79,4 (1997), 737

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, revtex, aps, epsf, psfig. submitted to Physical Review Letters, second version improved in detail

Scientific paper

10.1103/PhysRevLett.79.737

The recently reported subgap structures observed in the current-voltage characteristic of intrinsic Josephson junctions in the high-T_c superconductors Tl_2Ba_2Ca_2Cu_3O_{10+\delta} and Bi_2Sr_2CaCu_2O_{8+\delta} are explained by the coupling between c-axis phonons and Josephson oscillations. A model is developed where c-axis lattice vibrations between adjacent superconducting multilayers are excited by the Josephson oscillations in a resistive junction. The voltages of the lowest structures correspond well to the frequencies of longitudinal c-axis phonons with large oscillator strength in the two materials, providing a new measurement technique for this quantity.

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