
pmid: 9997215
La variation avec la frequence, de la chaleur specifique observee par Birge et Nagel dans le glycerol surfondu obeit aux lois en puissances fractionnaires dans les limites des hautes et des basses frequences. La relaxation de la chaleur specifique est interpretee en termes de la theorie a plusieurs corps de Dissado-Hill. Les valeurs evaluees des exposants suggerent un degre relativement eleve des correlations locales et un degre faible des correlations a longue distance des deplacements responsables de la relaxation observee. On trouve un bon accord entre les valeurs de n et de m et celles calculees a partir des donnees de la relaxation dielectrique et acoustique. On note la possibilite d'introduire les concepts fractals dans la description des phenomenes de relaxation dans le glycerol
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