Flux lattice melting and depinning in the weakly frustrated 2D XY model

Details Flux lattice melting and depinning in the weakly frustrated 2D XY model Flux lattice melting and depinning in the weakly frustrated 2D XY model

1995-02-14

arxiv.org/abs/cond-mat/9502055v1

Physics

Condensed Matter

4 pages, RevTeX, 3 figures in separate uuencoded file The manuscript will appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.51.11951

Monte Carlo simulations of the frustrated 2D XY model were carried out at small commensurate values of the frustration $f$. For $f=1/30$ a single transition was observed at which phase coherence (finite helicity modulus) and vortex lattice orientational order vanish together. For $f=1/56$ a new phase in which phase coherence is absent but orientational order persists was observed. Where comparison is possible, the results are in detailed agreement with the behavior of the lattice Coulomb gas model of vortices. It is argued that the helicity modulus of the frustrated 2D XY model vanishes for any finite temperature in the limit of weak frustration $f$.

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