Anisotropic current-voltage characteristics in type-II superconductors with planar pinning centers
Yasunori Mawatari
DOI 10.1103/PhysRevB.59.12033 · Physical Review B
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Abstract
Dynamics of vortices in planar pinning centers with thermal fluctuations were considered based on a Fokker-Planck equation, and anisotropic behavior of current-voltage characteristics were investigated. Because of the guided motion of vortices in planar pinning centers, both the longitudinal electric field E‖ (parallel to the transport current density J) and the transverse electric field E⊥ (perpendicular to J) depend strongly on the direction of J. When a driving force due to the current is tilted away from the pinning planes, the direction of vortex motion depends on both the magnitude of J and the strength of the pinning effects. Such a change in the direction of vortex motion brings about two striking features of the J dependence of E‖ and E⊥: (i) the dependence of E⊥ upon J can have a peak and (ii) under certain circumstances, the generation of E‖ or E⊥ can be enhanced by the pinning effects.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| 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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