Observation of linear magnetoelectric effect in a Dirac magnon antiferromagnet Cu${}_3$TeO${}_6$

Abstract

Cu${}_3$TeO${}_6$, a three-dimensional antiferromagnet forming a unique spin-web lattice of spin-1/2 Cu2+ ions below the Neel temperature T${}_N$ = 62 K, has recently been found to exhibit topological Dirac or nodal magnon dispersion. In this study, we report the discovery of the linear magnetoelectric (ME) effects in Cu${}_3$TeO${}_6$ below TN. Our pyroelectric current measurements at a constant magnetic field (H) reveal a linear increase of electric polarization (P) with H for both P // H and P $\perp$ H configurations; a maximum P // [110] = 20 $\mu$C/m${}^2$ is obtained at u0H // [1-10] = 14 T, corresponding to a linear ME coefficient 1.8 ps/m. Magnetic point group analysis and Monte-Carlo simulations confirm that finite linear ME coefficients are allowed in the off-diagonal and diagonal ME tensor components, consistent with the magnetic point group of ${\bar{3}}^{\prime }$. As the parity-time symmetry can be broken in the presence of H or electric field E in the linear ME materials, we envisage that Cu${}_3$TeO${}_6$ should exhibit a H- or E-induced transformation in the topological magnon dispersion from a Dirac point/nodal line type into two Weyl point types.