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A single material achieving multiple topological phases can provide potentialapplication for topological spintronics, whereas the candidate materials arevery limited. Here, we report the structure, physical properties, and possibleemergence of multiple topological phases in the newly discovered, air-stableEuCuBi single crystal. EuCuBi crystallizes in a hexagonal space group P63/mmc(No. 194) in ZrBeSi-type structure with an antiferromagnetic (AFM) ground statebelow TN = 11.2 K. There is a competition between AFM and ferromagnetic (FM)interactions below TN revealed by electrical resistivity and magneticsusceptibility measurements. With the increasing magnetic field, EuCuBi evolvesfrom the AFM ground state with a small amount of FM component, going throughtwo possible metamagnetic phases, finally reaches the field-induced FM phase.Based on the first-principles calculations, we demonstrate that the Dirac,Weyl, and possible mirror Chern insulator can be achieved in EuCuBi by tuningthe temperature and applying magnetic field, making EuCuBi a promisingcandidate for exploring multiple topological phases.

Structure, physical properties, and magnetically tunable topological phases in topological semimetal EuCuBi