Coupling between Phonons and Intrinsic Josephson Oscillations in Cuprate Superconductors
- Institut fuer Theoretische Physik, Universitaet Regensburg, D-93040 Regensburg (Germany)
- Physikalisches Institut III, Universitaet Erlangen-Nuernberg, D-91058 Erlangen (Germany)
The recently reported subgap structures in the current-voltage characteristic of intrinsic Josephson junctions in the high-T{sub c} superconductors Tl{sub 2}Ba {sub 2}Ca{sub 2}Cu{sub 3}O{sub 10+{delta} } and Bi{sub 2}Sr {sub 2}CaCu{sub 2}O{sub 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. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 527063
- Journal Information:
- Physical Review Letters, Vol. 79, Issue 4; Other Information: PBD: Jul 1997
- Country of Publication:
- United States
- Language:
- English
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