Unconventional Transverse Transport above and below the Magnetic Transition Temperature in Weyl Semimetal EuCd2As2

Y. Xu, L. Das, J. Z. Ma, C. J. Yi, S. M. Nie, Y. G. Shi, A. Tiwari, S. S. Tsirkin, T. Neupert, M. Medarde, M. Shi, J. Chang, and T. Shang
Phys. Rev. Lett. 126, 076602 – Published 18 February 2021
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Abstract

As exemplified by the growing interest in the quantum anomalous Hall effect, the research on topology as an organizing principle of quantum matter is greatly enriched from the interplay with magnetism. In this vein, we present a combined electrical and thermoelectrical transport study on the magnetic Weyl semimetal EuCd2As2. Unconventional contribution to the anomalous Hall and anomalous Nernst effects were observed both above and below the magnetic transition temperature of EuCd2As2, indicating the existence of significant Berry curvature. EuCd2As2 represents a rare case in which this unconventional transverse transport emerges both above and below the magnetic transition temperature in the same material. The transport properties evolve with temperature and field in the antiferromagnetic phase in a different manner than in the paramagnetic phase, suggesting different mechanisms to their origin. Our results indicate EuCd2As2 is a fertile playground for investigating the interplay between magnetism and topology, and potentially a plethora of topologically nontrivial phases rooted in this interplay.

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  • Received 12 August 2020
  • Revised 13 November 2020
  • Accepted 25 January 2021

DOI:https://doi.org/10.1103/PhysRevLett.126.076602

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Y. Xu1,*, L. Das1, J. Z. Ma2,3, C. J. Yi4, S. M. Nie5, Y. G. Shi4,6, A. Tiwari1,7, S. S. Tsirkin1, T. Neupert1, M. Medarde8, M. Shi3, J. Chang1,†, and T. Shang9,1,8,‡

  • 1Physik-Institut, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
  • 2Department of Physics, City University of Hong Kong, Kowloon, Hong Kong
  • 3Swiss Light Source, Paul Scherrer Institut, Villigen CH-5232, Switzerland
  • 4Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 5Department of Materials Science and Engineering, Stanford University, Stanford, California 94035, USA
  • 6Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • 7Condensed Matter Theory Group, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
  • 8Laboratory for Multiscale Materials Experiments, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 9Key Laboratory of Polar Materials and Devices (MOE), School of Physics and Electronic Science, East China Normal University, Shanghai 200241, China

  • *yangxu@physik.uzh.ch
  • johan.chang@physik.uzh.ch
  • tshang@phy.ecnu.edu.cn

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Issue

Vol. 126, Iss. 7 — 19 February 2021

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