Abstract
The compound (CH 3) 2CHNH 3CuCl 3 consists of ferromagnetic and antiferromagnetic alternating Heisenberg chains with S=1/2; a pair of ferromagnetically coupled spins behaves as a spin with S=1. Consequently, it has the Haldane gap in its energy spectrum at T=0 K. We investigated an issue what will happen when Cl ions are randomly replaced by other kind of anions, for instance by Br ions. Performing experiments on single crystals of mixed compounds (CH 3) 2CHNH 3Cu(Cl x Br 1− x ) 3 in which Cl ions are randomly replaced by Br ions, we found that the energy gap disappeared over the region 0.44< x<0.87. The experimental data, which prove the disappearance of the energy gap, are presented and discussed.
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