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000454499 1001_ $$0P:(DE-H253)PIP1027204$$aRuta, Beatrice$$b0$$eCorresponding author
000454499 245__ $$aWave-Vector Dependence of the Dynamics in Supercooled Metallic Liquids
000454499 260__ $$aCollege Park, Md.$$bAPS$$c2020
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000454499 520__ $$aWe present a detailed investigation of the wave-vector dependence of collective atomic motion in Au$_{49}$Cu$_{26.9}$Si$_{16.3}$Ag$_{5.5}$Pd$_{2.3}$ and Pd$_{42.5}$Cu$_{27}$Ni$_{9.5}$P$_{21}$ supercooled liquids close to the glass transition temperature. Using x-ray photon correlation spectroscopy in a previously uncovered spatial range of only a few interatomic distances, we show that the microscopic structural relaxation process mimics the structure and presents a marked slowing down at the main average interparticle distance. This behavior is accompanied by dramatic changes in the shape of the intermediate scattering functions, which suggest the presence of large dynamical heterogeneities at length scales corresponding to a few particle diameters. A ballisticlike mechanism of particle motion seems to govern the structural relaxation of the two systems in the highly viscous phase, likely associated with hopping of caged particles in agreement with theoretical studies.
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000454499 7001_ $$0P:(DE-H253)PIP1023620$$aHechler, S.$$b1
000454499 7001_ $$0P:(DE-H253)PIP1083697$$aNeuber, N.$$b2
000454499 7001_ $$aOrsi, D.$$b3
000454499 7001_ $$aCristofolini, L.$$b4
000454499 7001_ $$aGross, O.$$b5
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000454499 7001_ $$aFrey, M.$$b7
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000454499 7001_ $$aRiegler, S. S.$$b9
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000454499 7001_ $$0P:(DE-H253)PIP1005337$$aGutt, C.$$b12
000454499 7001_ $$0P:(DE-H253)PIP1006002$$aWestermeier, Fabian$$b13
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