2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/130238We present the results of exact diagonalization calculations of the isolated and isothermal on-site static susceptibilities in the anisotropic extended Heisenberg model on a linear chain with periodic boundary conditions. Based on the ergodicity considerations we conclude that the isothermal susceptibility will diverge as $T\to 0$ both in finite clusters and in the bulk system in two non-ergodic regions of the phase diagram of the system.reported at the International Conference on Magnetism, August 20-25, 2006 Kyoto, JapanStrongly Correlated ElectronsSoft Condensed Mattertext