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EPR Studies on the Effects of Dopant Cadmium (II) Ions on the Low Magnetic Dimensionality of Copper Calcium Acetate Hexahydrate

EPR investigations on Cd(II) doped copper calcium acetate hexahydrate of the composition Cu1-x Cdx Ca(Ac)4·6H2O (x=0.004–0.858) have been reported in the present communication. In the single crystal having as low as 0.4% Cd(II) concentration, single line spectrum having enhanced linewidth (7% enhancement) is obtained along the chain axis ( c-axis). For crystals having ≥8.2% Cd(II) concentration hyperfine structure appears. A large number of weak lines due to dimers, trimers and chains of finite length appear superimposed on the main line. It is inferred that Cd(II) impurity ions act as good reflectors and have profound influence on the spin diffusion process in the present 1D system. Along each of d- and e-axes in the tetragonal plane, doublet structures in the concentrated as well as in the dilute crystals are obtained. The doublet splitting (δHd) initially increases with increasing dilution; then the rate of increment gradually slows down and practically stops at Cd(II) concentration ∼55%. A model has been proposed to interpret the observed behaviour of δHd. Half-field lines due to forbidden ΔM s=±2 transition within the dimer triplet have been observed in the dilute crystals.