http://www.cnr.it/ontology/cnr/individuo/prodotto/ID57757

Evidence for a spinodal limit of amorphous excitations in glassy systems (Articolo in rivista)

Type

Label

Evidence for a spinodal limit of amorphous excitations in glassy systems (Articolo in rivista) (literal)

Anno

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Alternative label

C. Cammarota (1,2); A. Cavagna (2,3); G. Gradenigo (4,5); T.S. Grigera (6,7); P. Verrocchio (4,5,8) (2009)
Evidence for a spinodal limit of amorphous excitations in glassy systems
in Journal of statistical mechanics
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

C. Cammarota (1,2); A. Cavagna (2,3); G. Gradenigo (4,5); T.S. Grigera (6,7); P. Verrocchio (4,5,8) (literal)

Pagina inizio

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Rivista

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Note

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(1) Dipartimento di Fisica, Università di Roma `Sapienza', Piazzale Aldo Moro 5, 00185, Roma, Italy (2) Center for Statistical Mechanics and Complexity (SMC), CNR-INFM, Italy (3) Istituto Sistemi Complessi (ISC), CNR, Via dei Taurini 19, 00185 Roma, Italy (4) Dipartimento di Fisica, Università di Trento, via Sommarive 14, 38050 Povo, Trento, Italy (5) INFM CRS-SOFT, c/o Università di Roma `Sapienza', 00185, Roma, Italy (6) Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) and Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, 1900 La Plata, Argentina (7) CCT La Plata, Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina (8) Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), Spain (literal)

Titolo

Evidence for a spinodal limit of amorphous excitations in glassy systems (literal)

Abstract

What is the origin of the sharp slowdown displayed by glassy systems? Physical common sense suggests there must be a concomitant growing correlation length, but finding this length has been nontrivial. In random first-order theory, it is given by the size of amorphous excitations, which depends on a balance between their mutual interfacial energy and their configurational entropy. But how these excitations disappear when crossing over to the normal high temperature phase is unclear, chiefly due to lack of data about the surface tension. We measure the energy cost for creating amorphous excitations in a model glass-former, and discover that the surface tension vanishes at a well-defined spinodal energy, above which amorphous excitations cannot be sustained. This spinodal therefore marks the true onset of glassiness. (literal)

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