Abstract
Previously measured magnetic susceptibility and specific heat of powder samples CoCl 2 ·2NC 5 H 5 are compared with a theory for ferromagnetic Ising spin 1/2 chains weakly coupled by Ising antiferromagnetic interactions to their nearest neighbor chains. The weak interchain interaction is first treated within mean field theory; later short range order effects are included approximately via a reaction field formalism. Each chain, in its (approximate) effective field is treated exactly. Good agreement with experiment for both χ and C p is found with the following parameters: intrachain exchange J =10.8 K; interchain exchange J '=0.175 K; principal values of the g tensor, g // =7.0 and g ⊥ =5.0.
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