Ferromagnetic Weyl metal in EuAgP. (January 2022)

• Record Type: Journal Article
• Authors: Ge, Yongheng; Jin, Yahui; Zhu, Ziming
• Is Part Of: Materials today physics. Volume 22(2022)
• Publication Date: 2022-01
• Subjects: Ferromagnetic weyl semimetals -- Phase transitions -- First-principle calculations -- Surface state -- Transport properties; Materials science -- Periodicals; Physics -- Periodicals; Electronic journals; 530.41
• DOI: 10.1016/j.mtphys.2021.100570
• Languages: English
• ISSNs: 2542-5293

Abstract

Abstract: The combination of band topology with magnetic ordering provides an excellent platform to realize various magnetic topological phases. Based on first-principle calculations and symmetry analysis, we predict that two distinct topological phases can be switched in the ferromagnetic material EuAgP by tuning the direction of magnetic moment. In the absence of spin-orbit coupling (SOC), the material is half-metallic with only one spin-up channel around the Fermi level, giving rise to a pair of triple points (TPs) along C 6 axis, protected by the point group symmetry. As the magnetic moment is oriented along the z direction (with SOC included), the emergent TP in the absence of SOC splits into two Weyl points (WPs), featuring the nontrivial Fermi arcs on the side surface; however, when the magnetic moment is rotated to the x direction, a tiny band gap (<3.0 meV) appears around the TP due to the breaking of rotation symmetry, which can be regarded as the nearly TP. The intrinsic anomalous Hall conductivity of EuAgP is calculated for the different ferromagnetic states, which is sensitive to the magnetic ordering. Furthermore, we propose to realize the ideal Weyl semimetal with a single pair of WPs close to the Fermi level via partially substituting Eu by Ba. Graphical abstract: Image 1 The Highlights in our work includes: We have proposed a realistic material EuAgP for studying Weyl points and nearly triple point, which shows different surface states and anomalous Hall effect. . Our work reveals an ideal Weyl semimetal with a pair of Weyl nodes by alloying effect, which provide an excellent platform to study the physical properties of Weyl fermions. . We demonstrate the possibility to control the topological states via magnetic ordering, which is of great value for spintronics applications. .