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DY: Fachverband Dynamik und Statistische Physik
DY 24: Poster I
DY 24.50: Poster
Wednesday, March 28, 2007, 16:00–18:00, Poster D
Ageing, intermittency and metastability in spin glass systems — •Andreas Fischer1, Karl Heinz Hoffmann1, and Paolo Sibani2 — 1Institut für Physik, Technische Universität Chemnitz, D-09107 Chemnitz, Germany — 2Fysisk Institut, Odense Universitet, Campusvej 55, DK5230 Odense M, Denmark
Spin glasses are important prototypes for complex systems. They show numerous different phenomena including intermittency, metastability and ageing. Complex dynamical behavior is revealed in the low-temperature regime, especially below the spin glasses transition temperature. There a variety of features can be found, which show the systems' inability to attain thermodynamic equilibrium with its ambient during observable time scales. The resulting ageing and memory effects have been observed in many experiments. In particular spin glasses are good model systems as their magnetism provides an easy and accurate measurable observable representing important information about the systems state.
In order to understand the features observed, different model approaches have been applied for describing the systems internals. One prominent example of these model systems is the so called L-S-tree, a hierarchical model of the complex systems' state spaces within the low-temperature regime. The L-S-tree has proven its applicability by various successful reproductions of experimentally observed features.
Here we show some newly observed spin glass features and how these can be reproduced by L-S-tree models.