4.7 Article

Discontinuous Shear Modulus Determines the Glass Transition Temperature

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PHYSICAL REVIEW X
卷 5, 期 4, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.5.041033

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  1. Young Scholar Fund (YSF) of the University of Konstanz

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A solid-amorphous or crystalline-is defined by a finite shear modulus while a fluid lacks such. We thus experimentally investigate the elastic properties of a colloidal glass former near the glass transition: Spectroscopy of vibrational excitations yields the dispersion relations of longitudinal and transverse phonons in the glassy state. From the long-wavelength limit of the dispersion relation, we extract the bulk and the shear modulus. As expected, the latter disappear in a fluid and we measure a clearly resolved discontinuous behavior of the elastic moduli at the glass transition. This not only determines the transition temperature T-G of the system but also directly addresses recent discussions about elasticity during vitrification. We show that low-frequency excitations in our system are plane waves such that continuum elasticity theory can be used to describe the macroscopic behavior.

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