Evidence for Glass and Spin-Glass Phase Transitions From the Dynamic Susceptibility.
We present evidence that there is a phase transition, with a diverging static susceptibility, underlying the transformation of a liquid into a glass. The dielectric susceptibility, at frequencies above its characteristic value, shows a power-law tail extending over many decades to higher frequencies. An extrapolation of this behavior to the temperature where the dynamics becomes arrested indicates a diverging susceptibility. We present evidence for analogous behavior in the magnetic susceptibility of a paramagnet approaching the spin-glass transition. The similarity of the response in these two glassy systems suggests that some conventional lore, such as that the spin glass shows evidence for a diverging correlation length only in a nonlinear but not in the linear susceptibility, may be invalid.
The James Franck Institute and Department of Physics, The University of Chicago, Chicago, IL 60637.
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D
Bitko
The James Franck Institute and Department of Physics, The University of Chicago, Chicago, IL 60637.
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Coppersmith
The James Franck Institute and Department of Physics, The University of Chicago, Chicago, IL 60637.
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Leheny
The James Franck Institute and Department of Physics, The University of Chicago, Chicago, IL 60637.
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N
Menon
The James Franck Institute and Department of Physics, The University of Chicago, Chicago, IL 60637.
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Nagel
The James Franck Institute and Department of Physics, The University of Chicago, Chicago, IL 60637.
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Rosenbaum
dielectric susceptibility; glass transition; magnetic susceptibility; nonlinear susceptibility; specific-heat spectroscopy; spin-glass transition