Title: Inelastic x-ray scattering reveals the ergodic to nonergodic transition of salol, a liquid with local order
Author(s):

	L. Comez (IOM-CNR c/o Dipartimento di Fisica e Geologia, Universitá di Perugia, 06123 Perugia, Italy) ,
	D. Fioretto (Dipartimento di Fisica e Geologia, Universitá di Perugia, 06123 Perugia, Italy) ,
	J. Gapinski (Faculty of Physics, A. Mickiewicz University, Uniwersytetu Poznańskiego 2, 61-614 Poznań, Poland) ,
	G. Monaco (Department of Physics, University of Trento, Via Sommarive 14, 38123 Povo, Italy) ,
	A. Patkowski (Faculty of Physics, A. Mickiewicz University, Uniwersytetu Poznańskiego 2, 61-614 Poznań, Poland) ,
	W. Steffen (Max Planck Institute for Polymer Research, P.O. Box 3148, 55128 Mainz, Germany)

We have studied the high-frequency dynamics of salol by inelastic x-ray scattering over a wide temperature range between 50 and 450 K, across the glass transition. We find that salol efficiently realizes the mechanism of dynamical arrest described by the mode-coupling theory, as manifested by a cusp singularity in the behaviour of the non-ergodicity parameter and a Q dependence of the critical non-ergodicity parameter that is in phase with the static structure factor. These results confront positively the mode-coupling theory with liquids with local order.

Key words: glass transition, x-ray scattering, mode coupling theory
PACS: 64.70.Pf, 78.70.Ck, 61.20.Lc

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