Dresden 2006 – wissenschaftliches Programm

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MM: Metall- und Materialphysik

MM 36: Amorphous and Liquid Materials IV

MM 36.5: Vortrag

Donnerstag, 30. März 2006, 17:30–17:45, IFW B

Structure and electronic transport of a-Cu_x(Mn₅₀Al₅₀)_100−x — •Jan Rauchhaupt and Peter Häussler — Chemnitz University of Technology, Institute of Physics, 09107 Chemnitz, Germany

Amorphous phases are precursors of the cristalline state and hence interesting for investigating fundamental structure forming processes and the related evolvement of electronic transport.

In the last years we could show by many different classes of alloys (from e.g. metals, semiconductors, ionic glasses, to those containig transition metals) that the alloys organize themselves under the influence of a resonance interaction between two global systems, namely the electronic system of the valence electrons and the forming static structure. For TM-containing Al-alloys we discussed our results as a resonance interaction of the Al-p-electrons with the empty d-states of the TM via hybridisation. This model needs to be refined when a second transition metal comes in play.

The amorphous ternary alloys of Cu, Mn and Al were produced in situ at T=4 K in a HV-cryostate and were annealed up to the cristalline state. The static structure, by means of electron diffraction, the resistivity and the thermopower were measured as a function of temperature and composition.