Ising antiferromagnet with mobile, pinned, and quenched defects

Selke, W., Holtschneider, M., Leidl, R.
Institut für Theoretische Physik, Technische Hochschule Aachen,
D-52056 Aachen, Germany


Motivated by recent experiments on (Sr,Ca,La)14 Ca9 Cu24 O41, a two-dimensional Ising antiferromagnet with mobile, locally pinned and quenched defects is introduced and analysed using mainly Monte Carlo techniques.The interplay between the arrangement of the defects and the magnetic ordering as well as the effect of an external field are studied.