Collective flux creep in high-Tc superconductors
K. H. Fischer, T. Nattermann
DOI 10.1103/PhysRevB.43.10372 · Physical Review B
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Abstract
We develop a scaling approach to flux-line pinning in high-Tc superconductors. Our main result is a nonlinear relation V(jex)∼exp(-Cjex−μ) between the voltage V and the external current density jex, where the exponent μ is related to the roughness exponent and has been estimated in an earlier paper [T. Nattermann, Phys. Rev. Lett. 64, 2454 (1990)]. For the low-frequency ac resistivity we find two contributions ρ1(ω)∼ω2[1-(T/T*)lnωτ0]4/ψ and ρ2(ω)∼ω[1-(T/T*)lnωτ0]2/ψ, where ψ≊1 in three dimensions, and where T* is a characteristic temperature. Similar power laws are obtained for the dynamic susceptibility χ’’(ω), whereas the magnetization due to the change of the applied field varies in time as (lnt)−1/μ.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| ErBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7-y 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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