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 31.2: Vortrag
Mittwoch, 18. März 2015, 10:30–10:45, H 0107
On the process of structure formation and emergence of properties in AlMnCu — •Syed Sajid Ali Gillani, Steffen Schulze, and Peter Häussler — Chemnitz University of Technology, Physics Institute, 09107 Chemnitz
Most AlTM-alloys (TM : transition metal), which become amorphous for less than 60 at%TM, whereas AlMn stays amorphous up to much higher Mn-contents. The different influence of Mn may depend on its unique properties compared to the other 3d-TMs. It has outstanding structural and magnetic properties and hence is claimed to be one of the most complex elements. In its pure state it has three different crystalline phases which causes strong disorder, seen e.g. by its very high resistivity, as high as the surrounding elements in the Periodic Table have in their liquid state. To get a deeper insight we replace partially Mn by Cu along two different cuts through the corresponding ternary AlMnCu. Here we report on the emerging structural and physical transport properties and discuss the particular role of the TM.
Our analysis is based on self-organizing global spherical-periodic resonance effects between the Fermi gas and the forming static structure. The global resonances are self-organizing by their exchange of characteristic momenta. They trigger particle-density anomalies, hybridization effects as well as phase separation. The corresponding structure factors S(K) shows the resonance peak at Kpe= 2kF, indicating a spherical-periodic atomic order in r-space. The self-organizing processes are limited since e.g. hybridization needs minimal as well as maximal contents of TMs and depends on the chosen TM.