| The powder sample of (Dy0.375Y0.625)2Cu2O5 solid solution has been synthesized by the solid state reaction method. X-ray characterization showed that the sample is single phase with the following orthorhombic lattice parameters: a=1.0817 nm, b=0.3502 nm, c=1.2462 nm. Electron spin resonance (ESR) measurements of this compound has been carried on a Bruker E500 X-band spectrometer in the 4-300K temperature range. A single Lorentzian-shaped resonance line has been registered with changing integrated intensity, linewidth and resonance field. The integrated intensity of the resonance line showed a pronounced maximum at 21K and vanished at the transition to the antiferromagnetic ordering at TN=11K. Below 50K, on approach to TN, the linewidth exhibited a divergent behavior due to the onset of three-dimensional magnetic order. The observed changes of the ESR parameters are interpreted in terms of the low dimensional magnetism of the copper-oxygen system in (Dy0.375Y0.625)2Cu2O5. |
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