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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 24: Magnetic Heuslers, Half-Metals and Oxides II (organized by MA)

TT 24.10: Talk

Monday, March 31, 2014, 18:00–18:15, BEY 118

The influence of p- and n-doping on the intrinsic properties of the Heusler compound Fe2VAl — •Franziska Seifert1,2, Christian G.F. Blum1, Frank Steckel1, Christian Hess1, Hans-Joachim Grafe1, Bernd Büchner1, Sabine Wurmehl1, Stefan Martin2, Volker Klemm2, and David Rafaja21Leibniz-Institute for Solid State and Materials Research, Dresden, Germany — 2TU Bergakademie Freiberg, Germany

In this work, we studied the intrinsic properties of the Heusler compound Fe2VAl and the influence of p (V substituted by Ti)- and n-doping (Al substituted by Si) on the intrinsic materials properties using single crystals. Electron back scattering diffraction reveals the presence of a V-rich secondary ferromagnetic phase in particular in crystals with Si and in the parent compound, which could be further confirmed by TEM investigations. The depletion of V from the Fe2VAl matrix apparently leads to localized Fe moments and also to magnetic order in the corresponding samples. The evolution of magnetic order and thermoelectric key parameters were further analysed by means of nuclear magnetic resonance, transport and magnetization measurements. Interestingly, the sample with Ti and less V depletion shows a significant enhancement of the figure of merit compared to the other samples.

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