On the ferromagnetic phase breakdown of a two-dimensional Ising model with competing interactions
- 10 May 1981
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 14 (13) , L403-L406
- https://doi.org/10.1088/0022-3719/14/13/004
Abstract
The authors study a quenched random Ising magnet with nearest-neighbour exchange interactions jij=+or-J on a square lattice at T=0. A new-type effective field approach beyond mean field-approximation is used in order to obtain an estimate for the critical antiferro-magnetic bond concentration pc at which the ferromagnetic phase breaks down. The result is in quite good agreement with Bethe, Monte Carlo and replica method calculations. The Edwards-Anderson order parameter q within the authors formulation is also obtained. They found that both the magnetisation and q vanish at the same value pc=1/6.Keywords
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