Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

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

TT 24.10: Vortrag

Montag, 31. März 2014, 18:00–18:15, BEY 118

The influence of p- and n-doping on the intrinsic properties of the Heusler compound Fe₂VAl — •Franziska Seifert^1,2, Christian G.F. Blum¹, Frank Steckel¹, Christian Hess¹, Hans-Joachim Grafe¹, Bernd Büchner¹, Sabine Wurmehl¹, Stefan Martin², Volker Klemm², and David Rafaja² — ¹Leibniz-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.