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Eur. Phys. J. B 42, 543548 (2004) DOI: 10.1140/epjb/e2005-00012-0 THE EUROPEAN

Summary: Eur. Phys. J. B 42, 543­548 (2004)
DOI: 10.1140/epjb/e2005-00012-0 THE EUROPEAN
Kovacs effect in facilitated spin models of strong and fragile
J.J. Arenzon1,a
and M. Sellitto2
Instituto de F´isica, Universidade Federal do Rio Grande do Sul, CP 15051, 91501-970 Porto Alegre RS, Brazil
The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34100 Trieste, Italy
Received 18 August 2004 / Received in final form 9 November 2004
Published online 18 January 2005 ­ c EDP Sciences, Societ`a Italiana di Fisica, Springer-Verlag 2004
Abstract. We investigate the Kovacs (or crossover) effect in facilitated f-spin models of glassy dynam-
ics. Although the Kovacs hump shows a behavior qualitatively similar for all cases we have examined
(irrespective of the facilitation parameter f and the spatial dimension d), we find that the dependence
of the Kovacs peak time on the temperature of the second quench allows to distinguish among different
microscopic mechanisms responsible for the glassy relaxation (e.g. cooperative vs defect diffusion). We also
analyze the inherent structure dynamics underlying the Kovacs protocol, and find that the class of facili-
tated spin models with d > 1 and f > 1 shows features resembling those obtained recently in a realistic


Source: Arenzon, Jeferson J. - Instituto de Física, Universidade Federal do Rio Grande do Sul


Collections: Physics