Josephson coupling, in-plane pinning, and vortex dimensionality in Bi2Sr2CaCu2O8+δ
R. A. Doyle, J. D. Johnson, N. E. Hussey, A. M. Campbell, G. Balakrishnan, D. McK Paul, L. F. Cohen
DOI 10.1103/PhysRevB.51.9368 · Physical Review B
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Abstract
The c-axis I-V characteristics of an oxygen overdoped Bi2Sr2CaCu2O8+δ single crystal have been measured to determine the current density Jcc(T) across the CuO2 planes. In zero field, close to Tc, they show large capacitance resistively shunted junction behavior, a signature of phase locking of the Josephson junctions. In the quasi-force-free configuration with an applied field of 2T, the zero-field-cooled Jcc(T) has a nonmonotonic behavior, its decrease at intermediate temperatures coinciding with a change in the form of the I-V curve. History effects are also observed. These features can be explained in terms of both disorder in the in-plane pinning of flux pancakes and a change in the Josephson coupling as the temperature is lowered.
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. | 88.5 | Pressure unresolved | zero_resistance |
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