Random-field Ising model in the pair approximation
- 1 December 1988
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 38 (16) , 11669-11672
- https://doi.org/10.1103/physrevb.38.11669
Abstract
The random-field Ising model is studied in the pair approximation. Second-order transition lines and tricritical points are obtained for the bimodal (sum of two δ functions) random-field distributions. When the number of interacting nearest-neighbor spins z is 3, no tricritical point appears. A tricritical point exists for z≥4. A reentrant phenomenon can be seen for z=4.Keywords
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