Ag. Anders et al., EVIDENCE FOR STATIONARY NONLINEAR EXCITATIONS IN SPECIFIC-HEAT OF DIPOLAR MAGNET KER(MOO4)(2), Journal of magnetism and magnetic materials, 187(1), 1998, pp. 125-128
Specific heat studies of a single crystal of a quasi-one-dimensional d
ipolar magnet KEr(MoO4)(2) were performed in the temperature range fro
m 2 to 6 K in magnetic fields up to 1 T. The fields were applied along
the Er3+ chains. The behaviour of the magnetic specific heat was anal
ysed in the frame of two limiting models: the sine-Gordon theory and t
he Ising model in a magnetic field. The analysis revealed that the stu
died system resembles Ising behaviour rather than the behaviour predic
ted by sine-Gordon model. These results might be a preliminary indicat
ion of the presence of stationary non-linear magnetic excitations in t
he studied system. (C) 1998 Elsevier Science B.V. All rights reserved.