The investigation of vortex dynamics in high-temperature superconductors (HTSC) is always related to the question of defects. In the presence of random disorder the long range order of the magnetic flux line lattice is destroyed and a vortex glass (VG) phase  is established below a characteristic glass temperature TG. In the presence of heavy ion induced columnar defects this correlated disorder leads to a transition from vortex liquid to a Bose-glass (BG) phase . In both cases this transition can be described with the appropriate scaling theory. For the BG case the scaling relation between current density J and electric field E is described b
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