Viscosity at the dynamic crossover in o-terphenyl and salol under high pressure

The viscosities of two prototypical glass formers, o-terphenyl and phenyl salicylate (salol), are shown to exhibit a change in their temperature and pressure dependences at a constant value of the viscosity. This is the first evidence of a dynamic crossover in the viscosity induced by pressure. The...

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Bibliographic Details
Published in:Physical review letters 2004-06, Vol.92 (24), p.245702.1-245702.4, Article 245702
Main Authors: CASALINI, R, ROLAND, C. M
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Diffusive momentum transport (including viscosity of liquids)
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Glass transitions
Physics
Specific phase transitions
Transport properties of condensed matter (nonelectronic)
Viscosity of liquids
diffusive momentum transport
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Summary:The viscosities of two prototypical glass formers, o-terphenyl and phenyl salicylate (salol), are shown to exhibit a change in their temperature and pressure dependences at a constant value of the viscosity. This is the first evidence of a dynamic crossover in the viscosity induced by pressure. The characteristic value associated with the change in dynamics is material dependent, but independent of temperature and pressure. These results are in accord with the previous finding, for other glass formers, that the dielectric relaxation time assumes a density-independent value at the dynamic crossover.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.92.245702