4.8 Article

Searching for the Gardner Transition in Glassy Glycerol

期刊

PHYSICAL REVIEW LETTERS
卷 126, 期 2, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.028001

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  1. Simons Foundation [454935, ANR-10-LABX-0039-PALM]

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The study revealed the absence of a Gardner phase transition in glassy glycerol, suggesting that standard molecular glasses may suppress its existence. Instead, a specific localized excitation pattern was observed at low temperatures.
We search for a Gardner transition in glassy glycerol, a standard molecular glass, measuring the third harmonics cubic susceptibility chi((3))(3) from slightly below the usual glass transition temperature down to 10 K. According to the mean-field picture, if local motion within the glass were becoming highly correlated due to the emergence of a Gardner phase then chi((3))(3), which is analogous to the dynamical spin-glass susceptibility, should increase and diverge at the Gardner transition temperature T-G. We find instead that upon cooling vertical bar chi((3))(3)vertical bar decreases by several orders of magnitude and becomes roughly constant in the regime 100 - 10 K. We rationalize our findings by assuming that the low temperature physics is described by localized excitations weakly interacting via a spin-glass dipolar pairwise interaction in a random magnetic field. Our quantitative estimations show that the spin-glass interaction is twenty to fifty times smaller than the local random field contribution, thus rationalizing the absence of the spin-glass Gardner phase. This hints at the fact that a Gardner phase may be suppressed in standard molecular glasses, but it also suggests ways to favor its existence in other amorphous solids and by changing the preparation protocol.

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