Uniformly Frustrated XY Model without a VortexPattern Ordering
Abstract
The uniformly frustrated XY model with f=1/3 on a dice lattice is shown to possess an accidental degeneracy of its ground states so well developed 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 to the dissociation of halfvortex pairs.
 Publication:

Physical Review Letters
 Pub Date:
 March 2005
 DOI:
 10.1103/PhysRevLett.94.087001
 arXiv:
 arXiv:condmat/0409575
 Bibcode:
 2005PhRvL..94h7001K
 Keywords:

 74.81.Fa;
 05.20.y;
 64.60.Cn;
 Josephson junction arrays and wire networks;
 Classical statistical mechanics;
 Orderdisorder transformations;
 statistical mechanics of model systems;
 Condensed Matter  Superconductivity;
 Condensed Matter  Statistical Mechanics
 EPrint:
 4 pages, 3 figures