Critical currents of small Bi2Sr2CaCu2O8+x intrinsic Josephson junction stacks in external magnetic fields
A. Irie, S. Heim, S. Schromm, M. Mößle, T. Nachtrab, M. Gódo, R. Kleiner, P. Müller, G. Oya
DOI 10.1103/PhysRevB.62.6681 · Physical Review B
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Abstract
We present a study of the critical currents of small sized intrinsic Josephson junction stacks in external magnetic fields applied parallel to the CuO2 layers. The stacks consisting of 5–12 junctions were realized as mesa structures patterned on top of Bi2Sr2CaCu2O8+x single crystals. Lateral mesa dimensions ranged from 10×10 to 0.8×0.8μm2. For the largest structures a complex magnetic field dependence of the critical currents was found. With decreasing mesa dimensions the critical currents systematically approached a Fraunhofer-type magnetic field dependence. Measurements agree well with the results of numerical calculations using coupled sine-Gordon equations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88 | Pressure not reported | onset |
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