https://doi.org/10.1140/epjb/e2002-00361-0
Ising magnets with mobile defects
1
Institut für Theoretische Physik, Technische Hochschule, 52056 Aachen, Germany
2
Department of Physics, Texas A&M University, College Station, Texas, 77843-4242, USA
3
2. Physikalisches Institut,
Technische Hochschule, 52056 Aachen, Germany
Corresponding author: a selke@physik.rwth-aachen.de
Received:
22
August
2002
Revised:
4
October
2002
Published online:
19
November
2002
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.
PACS: 05.50.+q – Lattice theory and statistics (Ising, Potts, etc.) / 74.72.Dn – La-based cuprates / 75.10.Hk – Classical spin models
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002
