On the melting of the nanocrystalline vortex matter in high-temperature superconductors

Details On the melting of the nanocrystalline vortex matter in high-temperature superconductors On the melting of the nanocrystalline vortex matter in high-temperature superconductors

2005-06-02

arxiv.org/abs/cond-mat/0506054v1

Physics

Condensed Matter

Superconductivity

4 figures

Scientific paper

Multilevel Monte Carlo simulations of the vortex matter in the highly-anisotropic high-temperature superconductor Bi$_2$Sr$_2$CaCu$_2$O$_8$ were performed. We introduced low concentration of columnar defects satisfying $B_\phi\le B$. Both the electromagnetic and Josephson interactions among pancake vortices were included. The nanocrystalline, nanoliquid and homogeneous liquid phases were identified in agreement with experiments. We observed the two-step melting process and also noted an enhancement of the structure factor just prior to the melting transition. A proposed theoretical model is in agreement with our findings.

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