Abstract
Two types of experiments that provide information about the statics and dynamics of flux lattices in YBa2Cu3O7 will be discussed. The first are magnetic decoration experiments in which the flux lines are decorated with magnetic particles. From these experiments, it has been learned that the flux lattice is triangular with the normal value for the flux quantum. In ultrasound and high-Q mechanical oscillator experiments flux lattice melting has been examined. These experiments show that the flux lattice melts well below Hc2 into a vortex liquid state. These results suggest that the vortex solid and its melting is essentially two dimensional in character.
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