Collective motion of Josephson vortices in intrinsic Josephson junctions in Bi2Sr2CaCu2O8+y
G. Hechtfischer, R. Kleiner, K. Schlenga, W. Walkenhorst, P. Müller, H. L. Johnson
DOI 10.1103/PhysRevB.55.14638 · Physical Review B
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Abstract
We report on the experimental observation of moving Josephson vortices in mesa structures patterned on the surface of Bi2Sr2CaCu2O8+y single crystals. Mesas form stacks of typically 100 intrinsic Josephson junctions. In magnetic fields parallel to the superconducting copper oxide layers, a flux-flow branch develops on the current-voltage (I-V) characteristic. We investigate this branch in magnetic fields H up to 15 kOe for junctions with lateral dimensions ranging from 20×20 μm2 to 500×20 μm2. Investigations show that the voltage of the branch scales with 1/H. For mesas of the same height its slope is inversely proportional to the junction area showing that the flux-flow resistance is independent of the particular junction length. Microwave emission is sensitive to the direction of fluxon motion. This shows that the flux-flow branch in the I-V characteristic is caused by the collective motion of vortices. We compare our data to numerical simulations based on the coupled sine-Gordon equations for strongly coupled, stacked Josephson junctions. We show that the observed branch can be understood as a flux-flow state caused by vortices moving with the lowest collective-mode velocity of the system. The value derived for the Swihart velocity is in good agreement with recent measurements of the c-axis Josephson plasma frequency.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 86 | Pressure not reported | unknown |
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