Abstract
Using a variant of the AC susceptibility method, we have demonstrated that under non-equilibrium thermal conditions, spontaneous incoherent local diamagnetic fluctuations could lead to large coherent oscillatory relaxation in YBCO ceramics above T c. The probability and the amplitude of giant relaxation become maximum at ∼50% volume fraction of the diamagnetic state. Using the size of the largest synchronous cluster (determined from the amplitude of susceptibility relaxation) as coherence length (ξ VG ∼1.6±0.1 mm) together with the directly measured repetition period of the relaxation (τ∼10±1 s), the critical dynamic exponent has been calculated to be z=4.9±1. This value is in agreement with published vortex-glass exponent data.
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