We report on transport measurements using the dc flux transformer configuration in clean and twinned single crystals of YBa2Cu3O7−δ. We show that correlated disorder changes not only the order of the solid-liquid phase transition but also the nature of the vortices in the liquid state. In clean crystals, melting is shown to take place between a solid of vortex lines and a liquid with no correlation in the direction of the magnetic field.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)