%0 Journal Article %T Anti-Aging in Ultrastable Metallic Glasses %+ I. Physikalisches Institut [Göttingen] %+ European Synchrotron Radiation Facility (ESRF) %+ Institut Lumière Matière [Villeurbanne] (ILM) %+ Universitat Politècnica de Catalunya [Barcelona] (UPC) %A Luttich, M. %A Giordano, Valentina %A Le Floch, Sylvie %A Pineda, E. %A Zontone, F. %A Luo, Y. S. %A Samwer, K. %A Ruta, Béatrice %< avec comité de lecture %@ 0031-9007 %J Physical Review Letters %I American Physical Society %V 120 %N 13 %P 135504 %8 2018-03-30 %D 2018 %R 10.1103/PhysRevLett.120.135504 %K Collective dynamics %K Glasses %K Metallic glasses %K Coherent X-ray scattering %Z Chemical Sciences %Z Physics [physics] %Z Engineering Sciences [physics]Journal articles %X As ultrastable metallic glasses (UMGs) are promising candidates to solve the stability issues of conventional metallic glasses, their study is of exceptional interest. By means of x-ray photon correlation spectroscopy, we have investigated the stability of UMGs at the atomic level. We find a clear signature of ultrastability at the atomic level that results in slower relaxation dynamics of UMGs with respect to conventional (rapidly quenched) metallic glasses, and in a peculiar acceleration of the dynamics by near Tg annealing. This surprising phenomenon, called here anti-aging, can be understood in the framework of the potential energy landscape. For all samples, the structural relaxation process can be described with a highly compressed shape of the density fluctuations, unaffected by thermal treatments and regardless of the ultrastability of the glass. %G English %2 https://univ-lyon1.hal.science/hal-02290273/document %2 https://univ-lyon1.hal.science/hal-02290273/file/luettich-2018-UPCcommons.pdf %L hal-02290273 %U https://univ-lyon1.hal.science/hal-02290273 %~ CNRS %~ UNIV-LYON1 %~ ILM %~ UDL %~ UNIV-LYON