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Anomalous Hall effect and the role of Berry curvature in Co2TiSn Heusler films

Benedikt Ernst, Roshnee Sahoo, Yan Sun, Jayita Nayak, Lukas Müchler, Ajaya K. Nayak, Nitesh Kumar, Jacob Gayles, Anastasios Markou, Gerhard H. Fecher, and Claudia Felser
Phys. Rev. B 100, 054445 – Published 28 August 2019

Abstract

Various Co2-based Heusler compounds are predicted to be half-metallic ferromagnets with Weyl points. These systems with lack of time inversion symmetry possess a momentum space Berry curvature that can introduce exotic transport properties. The present study, on epitaxially grown Co2TiSn films, is an approach to understand and explore this possibility. The theoretical investigation shows that the Berry curvature is significant for the total anomalous Hall effect in experimentally grown Co2TiSn films. The deviation between the theory and experiment is due to the influence of side jump and skew scattering mechanisms. From a theoretical point of view, the intrinsic contribution to the anomalous Hall effect originates from partially gaped nodal lines due to the symmetry reduction induced by the lack of time reversal symmetry. Furthermore, from hard x-ray photoelectron spectroscopy measurements, we establish an electronic structure in the film that is comparable to the theoretical density of states calculations. These results provide intuitive insight into Heusler spintronics rooted in topological electronic structure.

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  • Received 13 July 2017
  • Revised 13 June 2019

DOI:https://doi.org/10.1103/PhysRevB.100.054445

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Benedikt Ernst1, Roshnee Sahoo1,*, Yan Sun1, Jayita Nayak1, Lukas Müchler1, Ajaya K. Nayak2, Nitesh Kumar1, Jacob Gayles1, Anastasios Markou1, Gerhard H. Fecher1, and Claudia Felser1

  • 1Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, D-01187 Dresden, Germany
  • 2National Institute of Science Education and Research, Jatni, Bhubaneswar 752050, India

  • *sahoo@cpfs.mpg.de; sahoo.roshnee@gmail.com; Binayak Acharya Degree College, Berhampur-760006, Odisha, India

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Issue

Vol. 100, Iss. 5 — 1 August 2019

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