Abstract
Randomly placed impurities that alter the local exchange couplings, but do not generate random fields or destroy the long-range order, roughen domain walls in Ising systems for dimensionality . They also pin (localize) the walls in energetically favorable positions. This drastically slows down the kinetics of ordering. The pinned domain wall is a new critical phenomenon governed by a zero-temperature fixed point. For , the critical exponents for domain-wall pinning energies and roughness as a function of length scale are estimated from numerically generated ground states.
- Received 12 April 1985
DOI:https://doi.org/10.1103/PhysRevLett.54.2708
©1985 American Physical Society