Surface critical behavior of two-dimensional dilute Ising models.

Selke, W.
Institut für Theoretische Physik, Technische Hochschule Aachen,
D-52056 Aachen, Germany

F. Szalma, P. Lajko
Institute for Theoretical Physics, Szeged University
H-6720 Szeged, Hungary

F. Igloi
Research Institute for Solid State Physics, H-1525 Budapest,
P.O.Box 49, Hungary
and
Institute for Theoretical Physics, Szeged University
H-6720 Szeged, Hungary

Abstract:

Ising models with nearest-neighbor ferromagnetic random couplings on a square lattice with a (1,1) surface are studied, using Monte Carlo techniques and a star-triangle transformation method. In particular, the critical exponent of the surface magnetization is found to be close to that of the perfect model, beta_s=1/2. The crossover from surface to bulk critical properties is discussed.


cond-mat/9707336