Albayrak, E.; Yilmaz, S. - In: Physica A: Statistical Mechanics and its Applications 387 (2008) 5, pp. 1173-1184
with spin- 1/2 atoms interacting with the nearest-neighbor (NN) bilinear interaction J1 is laid over the top of the other … with spin-1 atoms interacting with the bilinear NN interaction J2 and the crystal field interaction Δ, and the two layers … lower layer containing only spin-1 atoms. …