Abstract

Phase diagram of vortex states of high-T c superconductors with sparse columnar defects is obtained by Monte Carlo simulations. The Bragg–Bose glass phase characterized by hexagonal Bragg peaks and the diverging tilt modulus is observed at low doses for the first time. As the density of defects increases, the melting temperature increases. When the density of defects further increases, the transition to the Bose glass phase occurs. The interstitial liquid is observed between these glass phases and the vortex liquid phase.

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