Abstract
The absorption spectra corresponding to the transition 4T1 (4F)→2T1(2P) of Co2+ in CSCoCl32H2O were investigated under high magnetic fields up to 230kOe with a hybrid magnet. The anomalous line shapes of the magnon sideband with a double peak were observed under the magnetic fields parallel to the a- and c-axes. The behavior of the magnon sideband under the external magnetic fields is related to the exciton transfer. The intrachain exciton transfer becomes large under the magnetic field that induces the ferromagnetic components of the spins. This change of the exciton dispersion is reflected in the line shape of the magnon sideband. The anomalous behavior of the magnon sideband under the external fields was elucidated by the calculation of the line shape taking into account the field dependence of the exciton transfer.
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