New polarization effect and collective excitation in S=1/2 quasi 1D antiferromagnetic quantum spin chain
S. V. Demishev, A. V. Semeno, H. Ohta, S. Okubo, I. E. Tarasenko, T. V. Ishchenko, N. E. Sluchanko
Abstract
Anomalous polarization characteristics of magnetic resonance in CuGeO3 doped with 2% of Co impurity are reported. For the Faraday geometry this mode is damped for the microwave field Bw aligned along a certain crystallographic direction showing that the character of magnetic oscillation differs from the standard spin precession. The observed resonance coexists with the ESR on Cu2+ chains and argued not to be caused by "impurity" EPR, as previously claimed, but to correspond to a previously unknown collective mode of magnetic oscillations in S=1/2 AF quantum spin chain.
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