Vortex Matter and its Phase Transitions

Details Vortex Matter and its Phase Transitions Vortex Matter and its Phase Transitions

2000-05-19

arxiv.org/abs/cond-mat/0005311v1

Physics

Condensed Matter

Superconductivity

11 pages and 4 figures

Scientific paper

The mixed state of type II superconductors has magnetic flux penetrating the sample in the form of vortices, with each vortex carrying an identical quantum of flux. These vortices generally form a triangular lattice under weak mutually repulsive forces; the lattice spacing can be easily varied over many orders of magnitude by varying the external magnetic field. The elastic moduli of this lattice are small and this soft vortex matter can undergo phase transitions like normal matter, but with thermal fluctuations and underlying defects playing an important role. We discuss experimental studies on vortex matter phase transitions, with some emphasis on DC magnetisation measurements investigating the nature of the phase transition.

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