Abstract
A renormalized spin-wave theory is developed for the layer-type ferromagnet (C 2H 5NH 3) 2CuCl 4, and analytical expressions of the magnetization, susceptibilities and phase boundaries for the nearly two-dimensional ferromagnet with a very weak antiferromagnetic interlayer coupling have been obtained. These expressions are compared with the well-known results for conventional three-dimensional magnetic systems. Experimental results can be well explained by the present theory. It is shown that the spin-wave interactions have a significant effect on the susceptibility and that the main terms of the spontaneous magnetization coincide with the results given in the previous paper (I), in which a layer-type ferromagnet with an interlayer ferromagnetic coupling has been discussed.
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