Staircase-type magnetic-field dependence of the activation energy of Josephson interlayer vortices in Bi2Sr2CaCu2O8
J. C. P. Campoy, Y. Kopelevich, S. Moehlecke, R. Ricardo da Silva
DOI 10.1103/PhysRevB.63.052510 · Physical Review B
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Abstract
The anomalous depinning of Josephson interlayer vortices in Bi2Sr2CaCu2O8 high-Tc superconductor occurring at nearly field-independent temperature Tx=20–40K has been studied by means of ac susceptibility measurements with magnetic field applied parallel to CuO2 planes. From the frequency dependence Tx(vm) we define the flux-creep activation energy for Josephson vortices UJV(H) which increases with field and shows well-defined plateaus. In contrast, the activation energy of in-plane pancake vortices UPV(H) decreases with field, i.e., demonstrates a qualitatively different behavior.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 83.5 | Pressure unresolved | midpoint |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 82.9 | Pressure unresolved | midpoint |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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