ON THE TWIST EXCITATIONS IN A CLASSICAL ANISOTROPIC ANTIFERROMAGNETICCHAIN

In a recent Erratum [M. Daniel and R. Amuda, Phys. Lett. A 224 (1997) 389] the authors have explained that an algebraic error in their earli er analysis [Phys. Lett. A 191 (1994) 46] of a nonlinear evolution equ ation for a certain anisotropic antiferromagnetic chain in a magnetic field invalidates the twist solution obtained by them for any finite a nisotropy. Using a transformed variable and a different analysis of th at evolution equation in the presence of a field, we obtain a pi/2-tra veling twist solution for a finite anisotropy and a pi-twist for negli gible anisotropies. (C) 1997 Elsevier Science B.V.