Large unconventional anomalous Hall effect arising from spin chirality within domain walls of an antiferromagnet EuZn_2Sb_2
arxiv(2024)
摘要
Unconventional anomalous Hall effect was observed in antiferromagnetic state
of EuZn_2Sb_2. Scaling of unconventional Hall conductivity with the
longitudinal conductivity, and the magnitude of Hall angle indicate spin
chirality despite collinear magnetic structure. Anomalies in magnetoresistance
culminate in the same fields, in which the unconventional anomalous Hall
resistance has maxima. Monotonous decrease of their magnitude with increasing
temperature belittles here the role of spin-fluctuations, important in
isostructural compounds. These observations point to a prominent role of scalar
spin chirality within domain walls, when magnetic field tilts the Eu moments.
Simple calculation of such spin chirality shows it strongest in fields
characteristic for anomalous magnetotransport.
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