engleski

Dynamic measurements of flux creep and flow in YBa2Cu3O7−δ single crystals

Decay of magnetization was measured in YBa2Cu3O7- delta single crystals under the conditions of field sweep. In varying the sweep rate over eight orders of magnitude, the system could be carried from flux creep to flux flow regime. A broad crossover is observed in agreement with a distribution in pinning potentials. This novel technique enabled the first experimental determination of the relaxation time in the flux creep regime (tau~10^-3 s)

superconductor ; mixed state ; flux creep ; flux flow

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