Exciton Transfer in the One-Dimensional Antiferromagnet CsCoCl₃·2H₂O

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The magnetic field dependence of the absorption spectra corresponding to the transition ⁴T₁(⁴F)→²T₁(²P) of Co²⁺ in CsCoCl₃·2H₂O was investigated. In this transition region the Davydov splitting of the exciton lines was observed, and the magnitudes of the intersublattice exciton transfers were estimated. As a result, it was found that the exciton shows the two-dimensional migration closely related to the spin structure.