Competing interactions in the XYZ model.

ARLEGO MARCELO, CABRA DANIEL, DRUT JOAQUIN, GRYNBERG MARCELO

PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS

Año: 2003 p. 144426 - 144430

0163-1829

We study the interplay between a XY anisotropy ã, exchange modulations and an external magnetic field along the z direction in the XY Z chain using bosonization and Lanczos diagonalization techniques. We find an Ising critical line in the space of couplings which occur due to competing relevant perturbations which are present. More general situations are also discuss