We studied the effect of an external field on the rearrangement of hopping particles in a quarter-filled lattice-gas model introduced to investigate the oxygen ordering in YBa2Cu3Ox. In the fourfold-degenerate, cell-doubled phase of YBa2Cu3O6.5, oxygen diffusion is anisotropic due to the presence of Cu-O chains. Monte Carlo simulations show that these chains prefer an orientation parallel to the applied field. In the presence of an applied field, the two possible chain directions are distinguished analytically by using a a simple mean-field approximation.
ASJC Scopus subject areas
- Condensed Matter Physics