Observation of Individual Josephson Vortices in YBCO Bicrystal Grain-boundary Junctions

Details Observation of Individual Josephson Vortices in YBCO Bicrystal Grain-boundary Junctions Observation of Individual Josephson Vortices in YBCO Bicrystal Grain-boundary Junctions

2000-03-06

arxiv.org/abs/cond-mat/0003058v1

Physics

Condensed Matter

Superconductivity

11 pages, 4 figures

Scientific paper

10.1103/PhysRevB.61.R14952

The response of YBCO bicrystal grain-boundary junctions to small dc magnetic fields (0 - 10 Oe) has been probed with a low-power microwave (rf) signal of 4.4 GHz in a microwave-resonator setup. Peaks in the microwave loss at certain dc magnetic fields are observed that result from individual Josephson vortices penetrating into the grain-boundary junctions under study. The system is modeled as a long Josephson junction described by the sine-Gordon equation with the appropriate boundary conditions. Excellent quantitative agreement between the experimental data and the model has been obtained. Hysteresis effect of dc magnetic field is also studied and the results of measurement and calculation are compared.

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