Abstract
High frequency acoustic measurements have been performed at temperatures around the freezing pointT c in a cobalt insulating spin-glass. Assuming a Waller coupling mechanism between the spins and the acoustic wave, the data are interpreted in the framework of a dynamical model which takes into account the modulation of the reaction field. As a result, at the freezing temperature the characteristic relaxation time has no anomaly while the relevant susceptibility presents a maximum. The peculiar frequency dependence (as ω1/2) atT c of the complex elastic constant is experimentally put in evidence.
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Doussineau, P., Levelut, A. & Schön, W. Acoustic susceptibility of an insulating spin-glass. Z. Physik B - Condensed Matter 73, 89–102 (1988). https://doi.org/10.1007/BF01312159
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DOI: https://doi.org/10.1007/BF01312159