Coupling between phonons and intrinsic Josephson oscillations in cuprate superconductors
Ch. Helm, Ch. Preis, F. Forsthofer, J. Keller, K. Schlenga, R. Kleiner, P. Mueller
Abstract
The recently reported subgap structures observed in the current-voltage characteristic of intrinsic Josephson junctions in the high-Tc superconductors Tl2Ba2Ca2Cu3O10+δ and Bi2Sr2CaCu2O8+δ 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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