de Lima, J.P.; Gonçalves, L.L. - In: Physica A: Statistical Mechanics and its Applications 311 (2002) 3, pp. 458-474
The dynamic susceptibility χQzz(ω) of the isotropic XY-model (s=12) on the alternating superlattice (closed chain) in a transverse field h is obtained exactly at arbitrary temperatures. It is determined from the results obtained for the dynamic correlations 〈Sj,nz(t)Sl,mz(0)〉, which have...