2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/151697The exact results for thermodynamical properties of one-dimensional spin-1/2 isotropic XY model with Dzyaloshinskii-Moriya interaction in random lorentzian transverse field are obtained. This permits to discuss some approximate methods of disordered spin systems theory. The approximate scheme of examining the thermodynamics of one-dimensional spin-1/2 XXZ Heisenberg model with Dzyaloshinskii-Moriya interaction in random lorentzian field is suggested.33 pages, Latex, 8 figures, will appear in physica status solidi (b) 200, 1 (1997)Statistical Mechanicstext