Far-infrared absorption of Fe1-cMgcCl2
- 28 May 1976
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 9 (10) , L255-L258
- https://doi.org/10.1088/0022-3719/9/10/003
Abstract
Using far-infrared absorption spectroscopy, the variation of the frequency of the zone-centre magnon in Fe1-cMgcCl2 has been measured for the complete range of c. The magnon intensity does not vanish at the percolation limit. Instead it gradually becomes an electronic transition of Fe2+ in MgCl2 as c approaches 1. A mean-field model describes the frequency variation of the absorption quite well, but no simple model gives a satisfactory description of the lineshape. The measurements provide evidence for the existence of a local magnetic mode predicted by an ATA calculation for c=0.1.Keywords
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