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Surface ferromagnetism in a chiral topological semimetal CoSi

N.N. OrlovaA.A. AvakyantsA.V. TimoninaN.N. KolesnikovE.V. Deviatov
Dec 2022
摘要
Despite the chiral topological semimetal CoSi is known as bulk diamagnetic,it shows unusual surface ferromagnetism of debatable origin. The ferromagneticordering has been attributed to the distorted bonds, the superlattice ofordered vacancies, or even to topological surface textures due to the spinpolarization in the neighboring Fermi arcs. We experimentally comparemagnetization reversal curves for initially oxidized CoSi single crystals andcleaved samples with a fresh, oxide-free surface. While the oxidized CoSisamples do not show sizable ferromagnetism, the fresh CoSi surface gives astrong ferromagnetic response, which is accompanied by the pronouncedmodulation of the angle dependence of magnetization, as it can be expected foreasy and hard axes in a ferromagnet. In addition to the first order reversalcurves analysis, this observation allows us to distinguish between differentmechanisms of the ferromagnetic ordering in CoSi single crystals. We concludethat the surface states-induced RKKY interaction between distorted bonds nearthe sample surface is responsible for the strong ferromagnetic multi-domainbehavior for freshly cleaved samples.
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