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The glassy dynamics is a consequence of the elastic properties of the vortexmatter, and in principle may occur in any superconductor. However, whereas alarge amount of experimental evidence confirms glassiness in high Tcsuperconductors (HTS), the applicability of the whole framework developed todescribe vortex matter in HTS to other superconducting materials is unclear. Inthis framework, the particular creep behavior of MgB2, larger than creep ofconventional superconductor materials but much lower than HTS one, hadprecluded a complete understanding of the vortex regimes in this material. Inthis work we present an experimental study of relaxation processes of pure MgB2bulk samples measured by DC magnetization technique. We propose a novelself-consistent scaling method to analyze the data and extract the activationenergies. The observed experimental behavior can be described in a glassypicture, with a unique critical exponent &mu~1, characteristic of collectivecreep in the intermediate vortex bundle regime.

Glassiness in vortex matter in MgB2 probed by a novel scaling method for creep analysis