Transient regimes of flux creep in high-Tc superconductors
A. Gurevich, H. Küpfer, B. Runtsch, R. Meier-Hirmer, D. Lee, K. Salama
DOI 10.1103/PhysRevB.44.12090 · Physical Review B
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Abstract
Initial nonlogarithmic (t<t) stages of flux creep in superconductors have been studied both theoretically and experimentally. Measurements of the time constant τ in grain-oriented YBa2Cu3O7−x at T=20 K and B=6 T and various sweep rates dBe/dt are presented. The experimental data as well as an analysis of nonlinear flux diffusion for different flux-creep models indicate that the constant τ is a macroscopic quantity essentially depending upon initial conditions and sample geometry. The value τ is shown to be inversely proportional to the sweep rate with τ reaching 5×103 s at dBe/dt=5×10−6 Ts.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x 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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