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  • Letter

Berry curvature derived negative magnetoconductivity observed in type-II magnetic Weyl semimetal films

Ayano Nakamura1, Shinichi Nishihaya1, Hiroaki Ishizuka1, Markus Kriener2, Mizuki Ohno3, Yuto Watanabe1, Masashi Kawasaki2,3, and Masaki Uchida1,*

  • 1Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan
  • 2RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
  • 3Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan

  • *Author to whom correspondence should be addressed: m.uchida@phys.titech.ac.jp

Phys. Rev. B 109, L121108 – Published 14 March, 2024

DOI: https://doi.org/10.1103/PhysRevB.109.L121108

Abstract

Here we study nonmonotonic features which appear both in magnetoresistivity and anomalous Hall resistivity during the simple magnetization process, by systematically measuring type-II magnetic Weyl semimetal EuCd2Sb2 films over a wide carrier density range. We find that a positive magnetoresistivity hump can be explained as manifestation of a field-linear term in the generalized magnetoconductivity formula including the Berry curvature. As also confirmed by model calculation, the term can be negative and pronounced near the Weyl point energy in the case that the Weyl cones are heavily tilted. Our findings demonstrate extensive effects of the Berry curvature on various magnetotransport in magnetic Weyl semimetals beyond the anomalous Hall effect.

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