The interplay between magnetic properties and chemical ordering in the Co1-xPtx system is investigated theoretically and experimentally. Experimental results for the Curie temperature, magnetisation and paramagnetic susceptibility in ordered and disordered states are discussed within the framework of statistical models. The authors show that the magnetic moments on Pt atoms depend sensitively on the local chemical environment. A complete equilibrium phase diagram is also calculated and compared with the experimental data.
The phase diagram of the Ising square lattice with firstand second-nearest-neighbor antiferromagnetic interactions ( Ji and Jz) is calculated within the framework of the cluster-variation method.
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