Magnetism-induced topological transition in EuAs3

• Published in: Nature communications Vol. 12; no. 1; pp. 6970 - 9
• Main Authors: Cheng, Erjian, Xia, Wei, Shi, Xianbiao, Fang, Hongwei, Wang, Chengwei, Xi, Chuanying, Xu, Shaowen, Peets, Darren C., Wang, Linshu, Su, Hao, Pi, Li, Ren, Wei, Wang, Xia, Yu, Na, Chen, Yulin, Zhao, Weiwei, Liu, Zhongkai, Guo, Yanfeng, Li, Shiyan
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 30.11.2021; Nature Publishing Group; Nature Portfolio
• Subjects: 140/146; 639/766/119/2792; 639/766/119/997; Antiferromagnetism; Humanities and Social Sciences; Laboratories; Low temperature; Magnetic fields; Magnetic properties; Magnetism; Magnetoresistance; Magnetoresistivity; Metalloids; multidisciplinary; Phase transitions; Photoelectric emission; Physics; Science; Science (multidisciplinary); Spectroscopy; Spectrum analysis; Topology
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-021-26482-7

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 3 , 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 5 % 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 3 provides a rich platform to explore exotic physics arising from the interaction of magnetism with topology. Magnetic topological materials have a variety of interesting properties, but very few material realizations exist. Here, the authors report a topological nodal-line semimetal and a topological massive Dirac metal phase in EuAs 3 and demonstrate a magnetism-driven transition between these phases.