Coupling between phonons and intrinsic Josephson oscillations in cuprate superconductors
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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