Abstract
High-Tc vortex states with sparse and weak columnar defects are investigated numerically, and a new phase characterized by Bragg peaks associated with hexagonal symmetry is found. This new phase corresponds to the Bragg glass phase in high-Tc vortex states with point defects. As the number of columnar defects increases, the melting temperature of this new phase also increases owing to “partial trap” of flux lines to columnar defects. The phase transition from the Bragg glass phase to the Bose glass phase occurs when the number of columnar defects further increases. The “interstitial liquid” phase is also observed between these two glass phases and the vortex liquid phase.
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