Magnetism-induced topological transition in EuAs<sub>3</sub>.

Cheng, Erjian; Xia, Wei; Shi, Xianbiao; Fang, Hongwei; Wang, Chengwei; Xi, Chuanying; Xu, Shaowen; Peets, Darren C et al. · Nat Commun · 2021

basic_science · Level V

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Abstract

The nature of the interaction between magnetism and topology in magnetic topological semimetals remains mysterious, but may be expected to lead to a variety of novel physics. We systematically studied the magnetic semimetal EuAs<sub>3</sub>, demonstrating a magnetism-induced topological transition from a topological nodal-line semimetal in the paramagnetic or the spin-polarized state to a topological massive Dirac metal in the antiferromagnetic ground state at low temperature. The topological nature in the antiferromagnetic state and the spin-polarized state has been verified by electrical transport measurements. An unsaturated and extremely large magnetoresistance of ~2 × 10<sup>5</sup>% at 1.8 K and 28.3 T is observed. In the paramagnetic states, the topological nodal-line structure at the Y point is proven by angle-resolved photoemission spectroscopy. Moreover, a temperature-induced Lifshitz transition accompanied by the emergence of a new band below 3 K is revealed. These results indicate that magnetic EuAs<sub>3</sub> provides a rich platform to explore exotic physics arising from the interaction of magnetism with topology.