Effects of point defects on the phase diagram of vortex states in high-T-csuperconductors in the B vertical bar vertical bar c axis

The phase diagram for the vortex states of high-T-c superconductors with po int defects in the (B) over right arrow \ \ c axis is drawn by large-scale Monte Carlo simulations. The vortex slush (VS) phase is found between the v ortex glass (VG) and vortex liquid (VL) phases. The first-order transition between this novel normal phase and the VL phase is characterized by a shar p jump of the density of dislocations. The first-order transition between t he Bragg glass (BG) and VG or VS phases is also clarified, These two transi tions are compared with the melting transition between the BG and VL phases .