Dresden 2014 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

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

MM 51.3: Vortrag

Donnerstag, 3. April 2014, 10:45–11:00, IFW A

Amorphous Al-Pd Alloys – Structure and electronic properties — •Pierre Pudwell, Martin Stiehler, and Peter Häussler — Technische Universität Chemnitz, 09107 Chemnitz

The electronic influence on the formation of the static structure in condensed matter is known since decades. Furthermore, it is also known that not only the latter subsystem is able to adjust, but the electronic subsystem itself is also variable. Amorphous alloys were found to be perfectly suited to explore this mutual relationship which is based on an internal exchange of momentum between the two mentioned subsystems, in detail. Both subsystems try to come into resonance to each other. During the last years we reported on a particular variability of the electronic subsystem in Al-3d-TM alloys (TM: Sc, …, Cu) by hybridization effects between Al-3p- and TM-3d-states. In order to test whether such a hybridization-enhanced resonance is also effective in other systems, we are about to extend our investigations to systems with 4d- and 5d-TM.

In our contribution we show data on Al-Pd alloys as representative for a system with 4d-TM. Thin films of the material with thicknesses around 50 nm were deposited in high-vacuum at cryogenic temperatures. The electrical resistivity was measured during annealing to several hundred K, the static atomic structure after annealing to 350K. By comparing the diameter of the strongest diffraction ring with the diameter of the Fermi-sphere, stabilizing resonances based upon different mechanisms, leading to several concentration regions with different structural and electronic behaviour, were identified.