Abstract
The dynamical spin correlation function Sxx(Q, omega ) of dilute antiferromagnet CsCopMg1-pCl3 is analysed using a one-dimensional Ising-like model of S=1/2 with the nearest-neighbour interaction J and the next-nearest-neighbour interaction J'. The authors results reproduce well the experimental results from Nagler et al. (1984). They estimate J'/J approximately 0.1, which is compatible with a previous estimation. Two peaks found at omega approximately J and omega approximately 2J correspond to single soliton excitations and soliton-pair excitations, respectively. The interaction J' over a single Mg2+ ion broadens the peak at omega approximately J. As the temperature is increased, another peak appears at omega approximately 0.
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