Different glassy states, as indicated by a violation of the generalized Cauchy relation

Details Different glassy states, as indicated by a violation of the generalized Cauchy relation Different glassy states, as indicated by a violation of the generalized Cauchy relation

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003njph....5...80k&link_type=abstract

New Journal of Physics, Volume 5, Issue 1, pp. 80 (2003).

Physics

6

Scientific paper

Using Brillouin spectroscopy as a probe for high-frequency clamped acoustic properties, a shear modulus c44infty can be measured in addition to the longitudinal modulus c11infty already well above the thermal glass transition. On slow cooling of the liquid through the thermal glass transition temperature Tg, both moduli show a kink-like behaviour and the function c11infty = c11infty(c44infty) follows a generalized Cauchy relation (gCR) defined by the linear relation c11infty = 3c44infty + constant, which completely hides the glass transition. In this work we show experimentally that on fast cooling this linear transformation becomes violated within the glassy state, but that thermal ageing drives the elastic coefficients towards the gCR, i.e. towards a unique glassy state.

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