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Magnon‐Phonon Interaction Observed in Far Infrared Studies of FeCl2·2H2O and CoCl2·2H2O

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2 Author(s)
Hay, K. A. ; Division of Engineering and Applied Physics, Harvard University, Cambridge, Massachusetts 02138 ; Torrance, J. B.

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A study has been made of spin waves in the antiferro‐, ferri‐, and ferromagnetic phases of FeCl2·2H2O. These levels are found to interact strongly with a field independent level at 31.5 cm-1. A similar interaction is found in CoCl2·2H2O near 29.3 cm-1. This field independent level has been tentatively identified as a k=0, low‐lying optical phonon. This phonon appears to be infrared active only because of its coupling with nearby magnon levels. The experimental data for both materials is well described by a phenomenological magnon‐phonon interaction.

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Journal of Applied Physics  (Volume:40 ,  Issue: 3 )