Disordered vortex phases in YBa2Cu3O7-delta

The disordered vortex phases induced by line and point pinning in YBa2Cu3O7 -delta are explored. At high defect densities, only a single disordered sol id separated from the liquid phase by a melting line is observed. At low de fect densities the topology of the phase diagram changes dramatically, with a vortex lattice phase adjoining disordered phases at high or low field. C ritical points at the termination of the first-order melting line separate the lattice and the disordered phases. The line defect disordered phases fo llow the expected Bose glass behavior, while the point defect disordered ph ases do not exhibit the expected vortex glass behavior.