DOI: 10.1209/epl/i2003-00337-8
Europhys. Lett., 62 (1) , pp. 63-68 (2003)

Phase diagram of vortex lattice on a square pinning array in superconducting films

A. Tarasenko, V. Zablotskii and L. Jastrabìk

Institute of Physics, Academy of Sciences of the Czech Republic Na Slovance 2, 182 21 Prague 8, Czech Republic

(Received 13 June 2002; accepted in final form 24 January 2003)

Abstract
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.

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