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 51.4: Vortrag

Donnerstag, 3. April 2014, 11:00–11:15, IFW A

Magnetic-Nonmagnetic Transition Observed by Disorder-Order Transition in Quasicrystalline AlPdFe Thin Films by means of Magnetotransport Properties — •Jose Barzola-Quiquia^1,2, Martin Stiehler², and Peter Häussler² — ¹Abteilung Supraleitung und Magnetismus, Institut für Experimentelle Physik II, Universität Leipzig, Linnestr. 5, D-04103, Germany — ²Abteilung Physik Dünner Schichten, Institut für Physik, Technische Universität Chemnitz, D-09107, Germany

We report measurement results of the electrical resistivity, magnetoresistance and Hall effect of Al₇₀Pd₂₀Fe₁₀ alloy in amorphous and quasicrystalline phases. The measurements were performed in a temperature range of 1.2 to 300 K, applying fields of ± 8 T. An anomalous contribution to the Hall effect, induced by the magnetic order is observed only in the amorphous phase, after the transformation to the ordered quasicrystalline phase, this anomalous contribution disappears. Atomic structure information obtained by transmission electron spectroscopy reveals that the local icosahedral order is already present in the amorphous phase and is improved by the transition to the quasicrystalline phase. SQUID magnetometry measurements verify the magnetic properties of the amorphous phase and confirm the parameters obtained from the resistance measurements. The experimental results can be understood in the frame of electronic stabilized systems, where hybridization effects of Al₋s,p with Fe₋d electrons, play an important role.