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VOLUME 84 | ISSUE 5 | PAGE 305 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 General Physics Institute RAS 119991 Moscow, Russia +Molecular Photoscience Research Center, Kobe University, Nada, Kobe 657-8501, Japan PACS: 75.30.Gw, 75.45.+j, 76.90.+d 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 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 an S=1/2 AF quantum spin chain. Download PS file (GZipped, 659.8K)  |  Download PDF file (599.2K) Список работ, цитирующих данную статью, см. здесь. List of articles citing this article can be found here.