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Abstract
The parallel susceptibility of chain-like antiferromagnets is obtained by the spin wave theory considering kinematical interaction. The result obtained is very similar to that given by the Green function method for usual antiferromagnets. The correction due to kinematical interaction is expressed as a function of the spin reduction. It is found that the effect of kinematical interaction on the susceptibility is very large for chain-like antiferromagnets. Dynamical interaction is shown to contribute also greatly to the susceptibility. Numerical calculations are made for KCuF 3. Case of antiferromagnetic and ferromagnetic inter-chain exchange interaction are investigated numerically and it is concluded that the sign of the inter-chain exchange interaction is not important for chain-like antiferromagnets.
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