Periodic oscillations, peak-splitting and phase transitions of Josephson vortex flow resistance in Bi2Sr2CaCu2O8+δ
B. Y. Zhu, H. B. Wang, S. M. Kim, S. Urayama, T. Hatano, X. Hu
DOI 10.1103/PhysRevB.72.174514 · Physical Review B
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Abstract
We investigate both experimentally and theoretically transport properties of the Josephson vortices (JV) with a finite bias current along the c axis of the intrinsic Josephson junctions in layered high-Tc superconductor of Bi2Sr2CaCu2O8+δ. Employing the perturbed sine-Gordon equation and integrating a novel characterization factor of the difference between current distributions on neighboring layers ΔJ, we are successful in explaining new phenomena such as (1) oscillation with period Hp corresponding to adding one JV per layer, (2) its peak splitting, and (3) reverse of the peaks and valleys with increase of current in JV flow resistance as a function of magnetic field observed in our experiments. Additionally, our simulation shows concrete evidence for the sample size dependent phase transition between Hp∕2-period and Hp-period oscillations. The novel phenomena are expected to be useful for designing practical devices in experiments.
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. | 76 | Pressure not reported | unknown |
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