The understanding of the phase diagram of vortex matter in superconductors is a key issue, both for fundamental physics as well as for applications. The advent of the high temperature superconductors (HTSC) has triggered a big interest in this field, because of the richness of the of vortex matter phase diagram in these compounds. The phase diagram includes a vortex liquid phase and the possibility of a new Brag-glass to vortex-glass transition within the solid phase. Highly anisotropic compounds of the HTSC family exhibit additional phenomena related to the possible decomposition of vortex lines into stacks of point like "pancake" vortices, and the coexistence of crossed lattices of Josephson and Abrikosov type vortices. The dynamic properties represent one of the fundamental properties differentiating these vortex phases. In order to access those properties, we have developed a number of specific measurement techniques based on spatially and time resolved micro Hall probe magnetometry. We will present the experiments carried out on an archetypical layered HTSC, single crystalline BSCCO:2212. We have used heavy ion irradiation in order to introduce well-controlled defects in the form of columnar defects, acting as pinning centres for flux lines and modifying the phase diagram of vortex matter.

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1. Vortex fluctuations in underdoped Bi₂Sr₂CaCu₂O_8+δ single crystals