Ising magnets with mobile defects

Details Ising magnets with mobile defects Ising magnets with mobile defects

2002-08-28

arxiv.org/abs/cond-mat/0208562v2

Physics

Condensed Matter

Scientific paper

10.1140/epjb/e2002-00361-0

Motivated by recent experiments on cuprates with low-dimensional magnetic interactions, a new class of two-dimensional Ising models with short-range interactions and mobile defects is introduced and studied. The non-magnetic defects form lines, which, as temperature increases, first meander and then become unstable. Using Monte Carlo simulations and analytical low- and high-temperature considerations, the instability of the defect stripes is monitored for various microscopic and thermodynamic quantities in detail for a minimal model, assuming some of the couplings to be indefinitely strong. The robustness of the findings against weakening the interactions is discussed as well.

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