Fragmentation of magnetic flux in anisotropic superconductors
A. Gurevich
DOI 10.1103/PhysRevLett.65.3197 · Physical Review Letters
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Abstract
It is shown that in anisotropic superconductors uniform current flow can be unstable for current densities jf1<j<jf2, where jf1 and Jf2 essentially depend on the orientation of j. The instability leads to a stratification of the magnetic flux into macroscopic domains (macrovortices). Densities of closed shielding currents circulating inside the macrovortces can be well above the mean density of the transport current. The relation of such a macrovortex structure to the magnetic granularity of high-Tc oxides is discussed. The anisotropy is shown to result in the instability of both the Bean critical-state model and the uniform vortex glass with current-voltage characteristic of the form V∝exp(-const/jμ).
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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