Glass transition with decreasing correlation length during cooling of Fe50Co50 superlattice and strong liquids

Shuai Wei, Isabella Gallino, Ralf Busch, Charles Angell

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The glass transition is usually understood as a structural arrest that occurs during the cooling of liquids, trapping the system before it can crystallize. It occurs for all liquid classes, including metals. Theoretical interest has focused on the dynamical heterogeneity encountered during supercooling of ĝ€ fragileĝ€™ liquids. Many suggest that the slow-down is caused by increasing dynamical correlation lengths. Here we report kinetics and thermodynamics of arrest in a system that disorders while in its ground state, exhibits a large heat capacity change Î δCp=Cp,mobileĝ̂'Cp,arrested) on arrest, yet clearly is characterized by a static correlation length that decreases when approaching the transition temperature Tg from above. We show that our system, the Fe50Co50 superlattice, kinetically mimics an ideal strongĝ€™ liquid with a critical point. Introducing liquid critical-point simulations, we can then argue that strong liquids differ from fragile liquids by occupying opposite flanks of an underlying orderĝ€"disorder transition, which can be continuous, critical or weakly first order.

Original languageEnglish (US)
Pages (from-to)178-182
Number of pages5
JournalNature Physics
Volume7
Issue number2
DOIs
StatePublished - Feb 2011

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cooling
glass
liquids
critical point
disorders
supercooling
transition temperature
trapping
specific heat
thermodynamics
ground state
kinetics
metals
simulation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Glass transition with decreasing correlation length during cooling of Fe50Co50 superlattice and strong liquids. / Wei, Shuai; Gallino, Isabella; Busch, Ralf; Angell, Charles.

In: Nature Physics, Vol. 7, No. 2, 02.2011, p. 178-182.

Research output: Contribution to journalArticle

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