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TT: Fachverband Tiefe Temperaturen
TT 57: Topological Semimetals III
TT 57.1: Talk
Wednesday, March 14, 2018, 10:00–10:15, A 053
Anomalous Hall effect in topological magnetic materials — •Kaustuv Manna1, Lukas Muechler1,2, Ting Hui Kao1, Rolf Stinshoff1, Nitesh Kumar1, Jürgen Kübler1, Gerhard H. Fecher1, Chandra Shekhar1, Yan Sun1, and Claudia Felser1 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Department of Chemistry, Princeton University, Princeton, NJ, USA
In recent years, topological semimetals have emerged as a new frontier in the condensed matter community. With the interplay between the structural asymmetry and spin-orbit interaction, and details of Berry phase, new topological states are being discovered. Though inversion symmetry breaking Weyl fermion is demonstrated in TaAs family of compounds, the time-reversal breaking examples remain elusive. Here we demonstrate the formation of magnetic nodal lines in a topological magnetic Heusler compound Co2MnGa. Without spin-orbit coupling (SOC), we find three nodal lines due to the band crossing in majority spin channel. With SOC, nodal lines split up giving rise to the Weyl nodes, whose momentum space distributions depend on the magnetization direction. We observe giant anomalous Hall conductivity of 1600 Ω−1cm−1 with room temperature anomalous Hall angle 12% in Co2MnGa. In- fact, by suitable manipulations of the crystal symmetries and the band structures of the materials, one can selectively tuned the anomalous Hall conductivity from 0 to values up to 1600 Ω−1cm−1 in various magnetic Heusler compounds for next-generation topo-spintronics applications.