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

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 EuCd${}_2$Sb${}_2$ 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.

17 pages, 4 figures

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Cited by in corpus (6)

• Observation of in-plane anomalous Hall effect associated with orbital magnetization
• Manipulating magnetism and transport properties of EuCd${}_2$P${}_2$ with a low carrier concentration
• Stark difference in the in-plane anomalous Hall response in Zintl compounds EuA2Sb2 (A = Zn, Cd) thin films
• Recent advances in understanding and manipulating magnetic and electronic properties of Eu$M_2{X}_2$ ($M$ = Zn, Cd; $X$ = P, As)
• Origin of the large topological Hall effect in the EuCd${}_2$Sb${}_2$ antiferromagnet
• Magneto-cubic and magneto-linear dependence observed in an in-plane anomalous Hall magnet