Abstract
Resonant scattering from a phonon current can occur at the transition frequencies v i associated with the electronic or motional energy levels of impurity ions or centres present in the crystal. If the concentration of centres is ‘small’ the scattering will only be significant within a narrow frequency bandwidth Δ [1] which may be much less (⋞ 1 GHz) than that of the phonon current (~ 2kT for a thermal current or ~ 40 GHz at 1K). Under these conditions the frequency spectrum of the phonon current has sharp holes burned in it as shown in fig. 1(a). In many cases these can be moved to and fro by applying an external perturbation such as a magnetic field. Sharp features in the total scattering occur when two of these holes cross (v i= v j) or in some cases anticross and these provide spectroscopic information which can be of quite high precision and resolution.
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Challis, L.J. (1984). Crossing Effects in Phonon Scattering. In: Eisenmenger, W., Laßmann, K., Döttinger, S. (eds) Phonon Scattering in Condensed Matter. Springer Series in Solid-State Sciences, vol 51. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-82163-9_1
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DOI: https://doi.org/10.1007/978-3-642-82163-9_1
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