title: X-ray cross correlation analysis uncovers hidden local symmetries in disordered matter.
abstract: We explore the different local symmetries in colloidal glasses beyond the standard pair correlation analysis. Using our newly developed X-ray cross correlation analysis (XCCA) concept together with brilliant coherent X-ray sources, we have been able to access and classify the otherwise hidden local order within disorder. The emerging local symmetries are coupled to distinct momentum transfer (Q) values, which do not coincide with the maxima of the amorphous structure factor. Four-, 6-, 10- and, most prevalently, 5-fold symmetries are observed. The observation of dynamical evolution of these symmetries forms a connection to dynamical heterogeneities in glasses, which is far beyond conventional diffraction analysis. The XCCA concept opens up a fascinating view into the world of disorder and will definitely allow, with the advent of free electron X-ray lasers, an accurate and systematic experimental characterization of the structure of the liquid and glass states.
authors: Max-Planck-Institut für Metallforschung, Heisenbergstrasse 3, D-70569 Stuttgart, Germany.
authors: Peter
authors: P
authors: Wochner
authors: Christian
authors: C
authors: Gutt
authors: Tina
authors: T
authors: Autenrieth
authors: Thomas
authors: T
authors: Demmer
authors: Volodymyr
authors: V
authors: Bugaev
authors: Alejandro Díaz
authors: AD
authors: Ortiz
authors: Agnès
authors: A
authors: Duri
authors: Federico
authors: F
authors: Zontone
authors: Gerhard
authors: G
authors: Grübel
authors: Helmut
authors: H
authors: Dosch
mesh_terms: D000465:Algorithms; D007700:Kinetics; D008962:Models, Theoretical; D055585:Physical Phenomena; D012106:Research / Q000639:trends; D012107:Research Design; D012542:Scattering, Radiation; D014961:X-Ray Diffraction / Q000379:methods*; D014965:X-Rays