Critical phenomena at perfect and non-perfect surfaces
Institut für Theoretische Physik, Technische Hochschule,
52056 Aachen, Germany
Accepted: 19 November 1997
Published online: 15 February 1998
The effect of imperfections on surface critical properties is studied for Ising models with nearest-neighbour ferromagnetic couplings on simple cubic lattices. In particular, results of Monte Carlo simulations for flat, perfect surfaces are compared to those for flat surfaces with random, "weak" or "strong" , interactions between neighbouring spins in the surface layer, and for surfaces with steps of monoatomic height. Surface critical exponents at the ordinary transition, in particular , are found to be robust against these perturbations.
PACS: 05.50.+q – Lattice theory and statistics; Ising problems / 68.35.Rh – Phase transitions and critical phenomena / 75.30.Pd – Surface magnetism
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1998