Phase diagram of vortex lattice on a square pinning array in superconducting films
Institute of Physics, Academy of Sciences of the Czech Republic
Na Slovance 2, 182 21 Prague 8, Czech Republic
Accepted: 24 January 2003
We have analyzed the phase transitions in a square lattice of vortices using the thermodynamic approach. For a square array of the artificially created pin centers in superconducting film we have calculated the phase diagram, which reveals the re-entrant melting features. We explain this effect by the nonmonotonic temperature dependence of the vortex-vortex interaction potential.
PACS: 68.35.Rh – Phase transitions and critical phenomena / 74.25.Bt – Thermodynamic properties / 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics
© EDP Sciences, 2003