We introduce a fully frustrated XY model with nearest neighbor (nn) and next nearest neighbor (nnn) couplings which can be realized in Josephson junction arrays. We study the phase diagram for 0 ≤ x ≤ 1 (x is the ratio between nnn and nn couplings). When x < 1/ √ 2 an Ising and a BerezinskiiKosterlitz-Thouless transitions are present. Both critical… (More)

@inproceedings{Franzese2008TheFF,
title={The fully frustrated XY model with next nearest neighbor interaction},
author={Giancarlo Franzese and Rosario Fazio},
year={2008}
}