Berlin 2015 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MM: Fachverband Metall- und Materialphysik
MM 4: Liquid and Amorphous Metals I: Fragility and Dynamics of Metallic Glasses
MM 4.2: Talk
Monday, March 16, 2015, 10:30–10:45, H 0107
Time Dependent Nonlinear Response in Glassy Systems — •Birte Riechers1, Ranko Richert2, and Konrad Samwer1 — 1I. Physikalisches Institut, Georg-August-Universität Göttingen, Germany — 2Department of Chemistry & Biochemistry, Arizona State University, USA
Relaxation modes, especially their detailed description and understanding, play a major role for scientists working with glassy matter. One of many interesting aspects is the time scale of the change in fictive temperature under harmonic excitation in the nonlinear response regime[a].
By applying an external force sufficiently high to achieve nonlinear response, relaxation modes are excited. A time resolved measurement of the energy loss in glassy materials during a jump from the linear to the nonlinear response regime reveals the time scale of energy redistribution within the relaxation spectrum.
The behavior of plastic crystals, and metallic glasses was investigated experimentally using dielectric spectroscopy (DES), and dynamic mechanical analysis (DMA), respectively. Results are discussed with a focus on the behavior of fictive temperature regarding a connection to structural relaxation.
Financial support by the DFG Research Unit FOR 1394 is acknowledged.
[a] R.Richert, J.Chem.Phys. 130, 194509, 2009