Berlin 2015 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 31: Liquid and Amorphous Metals IV: Structure and Electronic Properties of Glasses

MM 31.5: Vortrag

Mittwoch, 18. März 2015, 11:15–11:30, H 0107

Structure and electronic properties of Al-Pd-Alloys — •Pierre Pudwell, Martin Stiehler, Steffen Schulze, and Peter Häussler — Technische Universität Chemnitz, Institut für Physik, 09107 Chemnitz

During the last years we reported on the influence of resonance-like effects during structure formation in condensed matter physics. These are based on an internal exchange of momentum between global subsystems, namely the valence electrons and the forming static structure. Hereby both subsystems are able to adjust their internal properties along different degrees of freedom. Amorphous (a) alloys proved to be perfectly suited to explore the evolution of this mutual adjustment in detail. Structure formation, phase stability and electronic transport properties were found to be strongly related. Especially in a-Al-transition metal (TM) alloys, due to the TM-d-states at E_F, a high flexibility of the electronic subsystem was observed.

In the present contribution we report on binary a-Al-Pd alloys in the form of thin films (≈50 nm). For different concentrations in the range from 20 to 75 at.% Pd, we measured the resistivity from 4K to several hundred K. The static atomic structure and the plasma resonance were obtained after annealing to 350K in a transmission electron microscope, the latter using electron energy loss spectroscopy (EELS). Although the overall behaviour of Al-Pd is comparable with other Al-TM systems distinctive deviations become obvious.