Berry curvature derived negative magnetoconductivity observed in type-II magnetic Weyl semimetal films
Physical Review B(2024)
摘要
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_2Sb_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.
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