Strong evidence for vortex-glass–collective-pinning theory in YBa2Cu3O7 superconductors
Yang Ren Sun, J. R. Thompson, Y. J. Chen, D. K. Christen, A. Goyal
DOI 10.1103/PhysRevB.47.14481 · Physical Review B
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Abstract
Magnetization studies on a melt textured-growth sample of YBa2Cu3O7−δ have tested several theoretical models to see which of them best describes the relaxation of supercurrents in this high-Tc superconductor. By combining conventional flux-creep experiments with measurements of magnetization versus magnetic-field sweep rate, we are able to detect the decay of magnetization in both its intermediate and very early stages, thereby expanding the observational window up to 5–6 decades of time. Among four recent models tested, only vortex-glass–collective-pinning theory consistently describes both stages. The resulting values for the characteristic exponent μ strongly depend on temperature and magnetic field. Values for the effective hopping time for vortices, teff, are ∼0.1 s.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ 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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