Field penetration and surface barriers in superconducting Bi2Sr2CaCu2O8+δ whiskers
M. S. James, S. T. Stoddart, S. J. Bending, S. Aukkaravittayapun, P. J. King, M. Henini
DOI 10.1103/PhysRevB.56.R5771 · Physical Review B
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Abstract
We have used an array of Hall probes to investigate the spatial dependence of the local magnetic induction of individual superconducting Bi2Sr2CaCu2O8+δ whiskers. At low temperatures (<~50K) the exponential temperature dependence of the field of first flux penetration, HP(T), is consistent with recent theories of flux penetration by two-dimensional pancake vortices. A power-law dependence at higher temperatures suggests that flux penetrates as three-dimensional lines nearer Tc. We also show directly that at high temperatures the flux distribution is dominated by a surface barrier, whereas at low temperatures bulk pinning appears to dominate.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 75.2 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78.9 | Pressure not reported | onset |
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