Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
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
PHYSICAL JOURNAL B
Kovacs effect in facilitated spin models of strong and fragile
glasses
J.J. Arenzon1,a
and M. Sellitto2
1
Instituto de F´isica, Universidade Federal do Rio Grande do Sul, CP 15051, 91501-970 Porto Alegre RS, Brazil
2
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