Uniformly frustrated XY model without vortex-pattern ordering

Details Uniformly frustrated XY model without vortex-pattern ordering Uniformly frustrated XY model without vortex-pattern ordering

2004-09-22

arxiv.org/abs/cond-mat/0409575v1

Phys. Rev. Lett. 94, 087001 (2005).

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.94.087001

The uniformly frustrated XY model with f=1/3 on a dice lattice is shown to possess a so well developed accidental degeneracy of its ground states that the difference between the free energies of fluctuations does not lead to the stabilization of a particular vortex pattern down to zero temperature. Nonetheless, at low temperatures the system is characterized by a finite helicity modulus whose vanishing (at a finite temperature) is related with the dissociation of half-vortex pairs.

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