Reduction of the magnetization decay rate in high-Tc superconductors
B. M. Lairson, J. Z. Sun, J. C. Bravman, T. H. Geballe
DOI 10.1103/PhysRevB.42.1008 · Physical Review B
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Abstract
Small decrements in the temperature ΔT of superconducting samples in the critical state are shown to cause substantial reduction in the rate of magnetic relaxation. Quantitative agreement is obtained between experimental data and a model, which assumes the decay of the supercurrent subsequent to the change in temperature can be described in terms of the critical state. Experiments were performed in an applied field of 5.07 kG, on thick film (1.6 μm) samples which generate a substantial self-field (∼5 kG). The effect of temperature reduction is shown to be calculable from a knowledge of the decay-rate exponent n and Jc(T) in the relevant temperature range. These results indicate that cooling in the critical state can be used to study magnetization decay at current densities reduced from the critical current.
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. | 85 | Pressure not reported | zero_resistance |
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