%ABassir, A [International Centre for Theoretical Physics, Trieste (Italy)]
%ABenyoussef, A [Laboratoire de Magnetisme et Physique des Hautes Energies, Rabat (Morocco). Dept. de Physique]
%D1994
%I; International Centre for Theoretical Physics (ICTP), Trieste (Italy)
%J
%K75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY, FERROMAGNETISM, HAMILTONIANS, CRYSTAL LATTICES, EXCITED STATES, GROUND STATES, MAGNETIC FIELDS, PHASE DIAGRAMS, TWO-DIMENSIONAL CALCULATIONS, 665400, QUANTUM PHYSICS ASPECTS OF CONDENSED MATTER
%PMedium: X; Size: 6 p.
%TFerromagnetic Potts model in a magnetic field: Finite lattice extrapolation of the (1+1)-dimensional Hamiltonian
%XThe (1+1)-dimensional Hamiltonian q-state ferromagnetic Potts model in an external magnetic field H is studied using finite lattice extrapolation techniques. The possible phases and their boundaries are determined from the ground state energy and the gap in the excitation energy, for arbitrary values of q and both for positive and negative field. We found that, for H positive, there is a critical value q{sub c}, where a first order transition line appears for q>q{sub c}, starting at the zero field transition point and terminating at a critical point in (h/{lambda}, H/{lambda}) plane, which separates the disordered phase and the ordered phase in the direction of H. For h negative a critical transition line separating the disordered phase and the others (q-1) ordered phases becomes first order for q>q{sub c}. (author). 12 refs, 2 figs.
%0Technical Report
IAEA Other: ON: DE95614447; TRN: XA9438444014022 INIS English