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Ising films with surface defects |
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| Authors: | M.-C. Chung M. Kaulke I. Peschel M. Pleimling W. Selke |
| Affiliation: | Fachbereich Physik, Freie Universi?t Berlin, 14195 Berlin, Germany, DE Institut für Theoretische Physik I, Universit?t Erlangen-Nürnberg, 91058 Erlangen, Germany, DE Institut für Theoretische Physik, Technische Hochschule, 52056 Aachen, Germany, DE |
| Abstract: | 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. Received 27 July 2000 and Received in final form 5 October 2000 |
| Keywords: | PACS. 05.50.+q Lattice theory and statistics (Ising Potts etc.) - 68.35.Rh Phase transitions and critical phenomena - 75.30.Pd Surface magnetism |
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