Altermagnetism in NiSi with non-collinear spins
arxiv(2024)
摘要
Recently, a new class of magnetic phenomenon, called altermagnetism, was
proposed where the underlying spin configuration resembles antiferromagnetic
structure, but the system violates PT (PT: Parity times Time reversal)
symmetry due to the alternation of crystalline symmetry across magnetic ions.
Although the original idea was proposed for the collinear spin structure, a
recent report by Cheong et al. has suggested that antiferromagnetic materials
with non-collinear spin structure and local alternation of crystalline
arrangement can also manifest altermagnetism. Besides breaking the PT
symmetry, altermagnetic compounds are also expected to exhibit anomalous Hall
effects of odd orders. Here, we discuss possible candidates in this regard. One
example is nickel monosilicide, which was recently shown to exhibit high
temperature antiferromagnetism with non-collinear spin structure. It fulfills
both criteria of breaking the PT symmetry and linear anomalous Hall
effect. In addition to NiSi, we also discuss two other potential experimental
venues for the exploration of altermagnetic states.
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