title: X-Ray Photon Correlation Spectroscopy Reveals Intermittent Aging Dynamics in a Metallic Glass.
abstract: We use coherent x rays to probe the aging dynamics of a metallic glass directly on the atomic level. Contrary to the common assumption of a steady slowing down of the dynamics usually observed in macroscopic studies, we show that the structural relaxation processes underlying aging in this metallic glass are intermittent and highly heterogeneous at the atomic scale. Moreover, physical aging is triggered by cooperative atomic rearrangements, driven by the relaxation of internal stresses. The rich diversity of this behavior reflects a complex energy landscape, giving rise to a unique type of glassy-state dynamics.
authors.affiliation: Heinz Maier-Leibnitz Zentrum (MLZ) and Physik Department, Technische Universität München, Lichtenbergstrasse 1, 85748 Garching, Germany.|Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln, Germany.
authors.forename: Zach
authors.initials: Z
authors.lastname: Evenson
authors.affiliation: ESRF-The European Synchrotron, CS40220, 38043 Grenoble, France.
authors.forename: Beatrice
authors.initials: B
authors.lastname: Ruta
authors.affiliation: Chair of Metallic Materials, Department of Materials Science and Engineering, Saarland University, Campus C6.3, 66123 Saarbrücken, Germany.
authors.forename: Simon
authors.initials: S
authors.lastname: Hechler
authors.affiliation: Chair of Metallic Materials, Department of Materials Science and Engineering, Saarland University, Campus C6.3, 66123 Saarbrücken, Germany.
authors.forename: Moritz
authors.initials: M
authors.lastname: Stolpe
authors.affiliation: Department of Physics, Universitat Politècnica de Catalunya-BarcelonaTech, Esteve Terradas 8, Castelldefels 08860, Spain.
authors.forename: Eloi
authors.initials: E
authors.lastname: Pineda
authors.affiliation: Chair of Metallic Materials, Department of Materials Science and Engineering, Saarland University, Campus C6.3, 66123 Saarbrücken, Germany.
authors.forename: Isabella
authors.initials: I
authors.lastname: Gallino
authors.affiliation: Chair of Metallic Materials, Department of Materials Science and Engineering, Saarland University, Campus C6.3, 66123 Saarbrücken, Germany.
authors.forename: Ralf
authors.initials: R
authors.lastname: Busch