Penetration of Josephson vortices and measurement of the c-axis penetration depth in Bi2Sr2CaCu2O8+δ: Interplay of Josephson coupling, surface barrier, and defects
H. Enriquez, N. Bontemps, A. A. Zhukov, D. V. Shovkun, M. R. Trunin, A. Buzdin, M. Daumens, T. Tamegai
DOI 10.1103/PhysRevB.63.144525 · Physical Review B
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Abstract
The first penetration field He(T) of Josephson vortices is measured through the onset of microwave absorption in the locked state in slightly overdoped Bi2Sr2CaCu2O8+δ single crystals (Tc≈84K). The magnitude of He(T) is too large to be accounted for by the first thermodynamic critical field Hc1(T). We discuss the possibility of a Bean-Livingston barrier, also supported by irreversible behavior upon flux exit, and the role of defects, which relates He(T) to the c-axis penetration depth λc(T). The temperature dependence of the latter, determined by a cavity perturbation technique, and a theoretical estimate of the defect-limited penetration field are used to deduce from He(T) the absolute value of λc(0)≈35μm.
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. | 84 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 86 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 84 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | onset |
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