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MM: Fachverband Metall- und Materialphysik

MM 51: Liquid and Amorphous Metals III - Electronic properties of amorphous alloys

MM 51.1: Vortrag

Donnerstag, 3. April 2014, 10:15–10:30, IFW A

How structures form and properties emerge — •Peter Häussler — Chemnitz University of Technology, Physics Institute, 09107 Chemnitz, Germany

The formation of crystals and the accompanied emergence of their physical properties are far from being understood. Quantum chemistry, statistical physics, as well as thermodynamics all play an indispensable role. But, each of them is unable to solve the problem alone. The formation of structure cannot be explained by interacting individual atoms alone, instead, their cooperative actions should properly be accounted too. Cooperatively acting species would reduce the tremendous number of parameters to a manageable level. In this contribution we report on global subsystems and their interaction. Under the given external constraints they form global resonances by self-organizing mutually their internal features, causing global anti-bonding as well as bonding states at different energies. Accordingly, by occupying the latter, both, the decrease of the total energy and the creation of entropy become maximal. Pseudo-gaps arise at the Fermi energy and by this, major structural features are influenced. Electronic transport anomalies, the thermal stability, as well as many others emerging physical quantities are strongly influenced.

Our description follows the formal language of thermodynamics by an extended version (General Dynamics) applied to the global subsystems and introduces momentum as well as angular momentum, both included in quantum chemistry and statistical physics, but not in classical thermodynamics, so is able to form a bridge between them.