https://doi.org/10.1007/s100510070014
Ising films with surface defects
1
Fachbereich Physik, Freie Universiät Berlin, 14195 Berlin, Germany
2
Institut für Theoretische Physik I, Universität Erlangen-Nürnberg,
91058 Erlangen, Germany
3
Institut für Theoretische Physik, Technische Hochschule, 52056 Aachen, Germany
Received:
27
July
2000
Revised:
5
October
2000
Published online: 15 December 2000
The influence of surface defects on the critical properties of magnetic films is studied for Ising models with nearest-neighbour ferromagnetic couplings. The defects include one or two adjacent lines of additional atoms and a step on the surface. For the calculations, both density-matrix renormalization group and Monte Carlo techniques are used. By changing the local couplings at the defects and the film thickness, non-universal features as well as interesting crossover phenomena in the magnetic exponents are observed.
PACS: 05.50.+q – Lattice theory and statistics (Ising, Potts, etc.) / 68.35.Rh – Phase transitions and critical phenomena / 75.30.Pd – Surface magnetism
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000
