1988 ::: Pervasiveness of cluster excitations as seen in the Mössbauer spectra of magnetic materials

Rancourt, D.G.

Hyperfine Interact  40, 183–194 (1988).

https://doi.org/10.1007/BF02049089

Abstract
Magnetic cluster excitations in various physical systems (e.g., soliton bearing one-dimensional solids, metallic alloys, amorphous materials, small particle aggregates, magnetically ordered substances near TC, transition metal di-chloride graphite intercalation compounds, etc.) are described. Use of Fe-57 Mössbauer effect spectroscopy as a probe of the spin dynamics for inverse autocorrelation times between ∼107Hz to ∼1010 Hz is emphasized. Particular attention is given to systems which exhibit local or long range magnetic order and whose Mössbauer spectra must therefore be described by more than one autocorrelation (or dwell) time for fluctuations between different allowed hyperfine field directions on a given site.

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