Abstract
Magnetic susceptibility measurement has been carried out on the Haldane system (CH 3 ) 4 NNi(NO 2 ) 3 containing non-magnetic Zn 2+ and magnetic Cu 2+ impurity ions. For each impure system, magnetic susceptibility is described by the sum of two contributions; one is from the Haldane state and the other is a paramagnetic contribution. The latter contribution increases proportionally with impurity concentration. For 1D system shortened by Zn 2+ impurity ions, the paramagnetic contribution obeys the Curie law, and its absolute value of the susceptibility is found to amount nearly 40% of the theoretical estimation for the VBS model where the spin with its value S =1/2 appears at the both edges of 1D segments. In the case for the system with Cu 2+ impurity ions, the paramagnetic contribution is much smaller than the results for the Zn 2+ impure systems. This reduction of the magnetic moment of Cu 2+ ion for S =1/2 is qualitatively different from the case for the enhanced moment of Cu 2+ ion in the anisotropic ...
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