Abstract
A decay model for glassy systems is described which quantitatively includes decay regimes such as exponential, power law and logarithmic, and “changeover” regimes as a function of b = T/ Ē, with Ē as mean energy of an initial Poissonian distribution ≈ exp(- E/ Ē) of activation energies E. The model is applied to the decay of critical magnetization in a YBa 2Cu 3O x granular sample studied indirectly by measuring the hysteretic signal splitting registered by field modulated microwave technique at different field scanning speeds. The resulting values b -1 = Ē/T seem to decrease linearly when approaching T c.
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