  Resonant magnetoabsorption spectra for CuGeO3 single crystals containing 2%
of Co impurity are studied in the frequency range 60-360 GHz in magnetic field
up to 16 T at temperatures 2-60 K. It is found that together with the resonance
on Cu2+ chains a new absorption line related with Co2+ ions appears in EPR
spectrum. The full set of spectroscopic data (g-factors, linewidths, integrated
intensities) have been determined for both resonances. The obtained results
exhibit considerable deviations from the universal scenario of doping for
CuGeO3 and discussed in the frames of the models of the quantum critical
behavior and the three-dimensional antiferromagnet with the reduced by disorder
Neel temperature. The Oshikawa and Affleck theory for EPR in 1D S=1/2 AF spin
chain is compared with experiment.
