Abstract
Various Co2 based Heusler compounds are predicted to be Weyl materials. These systems with broken symmetry possess a large Berry curvature, and introduce exotic transport properties. The present study on epitaxially grown Co2TiSn films is an initial approach to understand and explore this possibility. The anomalous Hall effect in the well-ordered Co2TiSn films has been investigated both experimentally and theoretically. The measured Hall conductivity is in good agreement to the calculated Berry curvature. Small deviations between them are due to the influence of skew scattering on the Hall effect. From theoretical point of view, the main contribution to the anomalous Hall effect originates from slightly gapped nodal lines, due to a symmetry reduction induced by the magnetization. It has been found that only part of the nodal lines contributed near to the anomalous Hall conductivity at a fixed Fermi energy which can be explained from a magnetic symmetry analysis. Furthermore, from hard x-ray photoelectron spectroscopy measurements, we establish the electronic structure in the film that is comparable to the theoretical density of states calculations. The present results provide deeper insight into the spintronics from the prospect of topology.
Highlights
Spintronics has fascinated researchers, as it has abundant advantages over conventional electronics [1,2]
Berry curvature calculations were performed for Co2TiSn, and an intrinsic anomalous Hall conductivity of 100 S/cm was calculated
This anomalous Hall conductivity originates from slightly gaped nodal lines due to a symmetry reduction induced by the magnetization
Summary
Spintronics has fascinated researchers, as it has abundant advantages over conventional electronics [1,2]. Heusler alloys have attracted interest in this regard due to their high Curie temperature TC and tunability in terms of structural, electronic, and magnetic properties [3,4,5,6,7]. There are many theoretical and experimental studies that aim to understand the fundamental origins of the anomalous Hall effect from the perspective of Berry curvature [17]. Co2-based Heusler compounds were proposed to be half-metallic ferromagnets, where the band crossing points have been termed “magnetic monopoles” or Weyl points [20,21]. These band crossing points near the Fermi energy may lead to exotic transport phenomena [20,21]. The total anomalous Hall effect shows contributions from both scattering mechanisms (skew scattering and side jump) and the intrinsic mechanism
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