Two-step melting of the vortex solid in layered superconductors with random columnar pins

Details Two-step melting of the vortex solid in layered superconductors with random columnar pins Two-step melting of the vortex solid in layered superconductors with random columnar pins

2003-08-05

arxiv.org/abs/cond-mat/0308084v1

Phys. Rev. Lett. 91 127002 (2003)

Physics

Condensed Matter

Superconductivity

To appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.91.127002

We consider the melting of the vortex solid in highly anisotropic layered superconductors with a small concentration of random columnar pinning centers. Using large-scale numerical minimization of a free-energy functional, we find that melting of the low-temperature, nearly crystalline vortex solid (Bragg glass) into a vortex liquid occurs in two steps as the temperature increases: the Bragg glass and liquid phases are separated by an intermediate Bose glass phase. A suitably defined local melting temperature exhibits spatial variation similar to that observed in experiments.

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