INVERSE ROUGHENING TRANSITION IN THE STAGGERED BODY-CENTERED SOLID-ON-SOLID MODEL

The F model and inverse F model in a staggered electric field are exam ined by using transfer matrices and finite-size scaling. It is shown t hat such a field induces a Kosterlitz-Thouless transition in the inver se F model, corresponding to an ''inverse'' roughening transition in t he body-centered solid-on-solid representation: a crystal facet appear s above a certain temperature. It disappears again in the limit of inf inite temperature. We find the location of this phase transition as a function of staggered field and for a specific choice of this field we estimate the facet size as a function of temperature.