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Un point critique thermodynamique dans les verres dévoilé par les réponses d'ordre élevé.

Abstract : The puzzle of the glass transition mainly resides in the fact that a supercooled liquid undergoes when cooled down, a spectacular dynamics slow down, while no evidence of any kind of thermodynamic transition has been measured through usual means.The absence of any known growth of a length scale that could explain the glassy dynamics leads to a wide range of competing models and theories trying to explain the origins of this dynamics.In the last decade, a promising lead has been put forward, that could allow the community to experimentally access such a growing length scale, through third order non-linear dielectric response measurements, and more in particular this response's temperature dependence. Indeed, non-linear response measurements reflect the collective effects that characterize the amorphous order and translate into high order correlation functions.During this PhD, we have built upon this experimental and theoretical background to design a fifth order non-linear dielectric response measurement experiment. In collaboration with a team of experimentalists and theoreticians, we have used these results in conjunction with third order response measurement results to make a very strong case advocating the existence of a thermodynamic critical point in Glycerol and Propylene Carbonate. This is a very significant advance in the understanding of the behaviour of glassy materials.This ground breaking discovery puts very strong constraints on existing theories and will contribute to end some decades-long theoretical debates within the glassy community.
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Submitted on : Monday, February 6, 2017 - 4:46:07 PM
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Samuel Albert. Un point critique thermodynamique dans les verres dévoilé par les réponses d'ordre élevé.. Matière Condensée [cond-mat]. Université Paris-Saclay, 2016. Français. ⟨NNT : 2016SACLS534⟩. ⟨tel-01458088⟩



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