Abstract

Laboratoire de Physique Theorique des Liquides, Universite Pierre et Marie Curie, Boite 121, 4 Place Jussieu,75252 Paris, Cedex 05, France(Received 29 March 2001; published 16 October 2001)The count of Lagrangian bonding constraints in ternary Ge S I glasses isestablished from the molecular structure using Raman scattering and Þrst-principles cluster calculations.The results show that decreases to 3 as y increases close to , where a sharply deÞnedglobal minimum in the nonreversing heat sow, near , is observed in scanning calorimetry.Here we have a rigidity transition induced by I dangling ends, with its sharpness resulting from theabsence of self-organization in the random network.

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