Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II

MA 52.51: Poster

Donnerstag, 15. März 2018, 15:00–18:00, Poster C

Magnetism and electric transport in Heusler compounds Co₂V_1−xCr_xGa — •Jörn Bannies, Johannes Kroder, Gerhard H. Fecher, and Claudia Felser — Max Planck Institut CPfS, Dresden, Germany

During the last decades Heusler compounds have attracted much interest due to their huge variety of properties. Among them the half-metallic ferromagnetism has been intensively investigated. Characteristically the saturation magnetization in half-metallic ferromagnets such as Co₂ based Heusler compounds scales linearly with the valence electron count which is known as the Slater Pauling rule.

Recently Co₂ based Heusler compounds have been proposed to host Weyl fermions. The anomalous Hall effect is assumed to be maximized when the Weyl nodes reside at the Fermi level. Thus, shifting the Weyl nodes around the Fermi level can be used to verify this assumption. Due to the large compositional variability provided by Heusler compounds this is easily be achieved by substitutional alloying.

Here we report on the Heusler system Co₂V_1−xCr_xGa. Substitution of V by Cr is intended to shift the Weyl nodes to higher energies passing through the Fermi level, thereby generating a maximum in the anomalous Hall conductivity. This is expected to occur at x≈0.5. Polycrystalline samples with x ranging from 0 to 1 were prepared by conventional arc melting technique. After annealing, the magnetisation followed obey the Slater Pauling rule which hints on their half-metallicity. Additionally temperature dependent measurements of the magnetoresistivity were carried out.