Abstract
Room temperature electron paramagnetic resonance (EPR) measurements were carried out on single crystals of CuCl 2·2H 2O around their three crystallographic axes at X-band (9.5 GHz) and Q-band (35 GHz). Owing to the interchain exchange interaction which is stronger than the difference in Zeeman energies of the dissimilar ions, the EPR spectrum is always reduced to a Lorentzian singlet, not only at X-band, but even at Q-band. There is no frequency dependence of the g factors from X-band to Q-band. The sinusoidal angular dependence of g 2 in any plane is related to the fact that the relative anisotropy Δ g/ g is moderate in the a, c plane. The angular dependence of the linewidth is analyzed, namely in the a, c plane, where the interchain contribution Δ H 12 is extracted from the total linewidth Δ H. This permits us to determine the following value of the interchain exchange interaction: J′/ k = (0.40 ± 0.04)K, from which we conclude that the single crystal EPR study at Q-band provides a direct and precise method to determine the exchange interaction J′ between inequivalent copper ions.
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