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arXiv · 2305.00215

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

Aga Shahee·Kyongjun Yoo·B. Koteswararao·N. V. Ter-Oganessian·Kee Hoon Kim
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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 $\bar{3}'$. 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.

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Aga Shahee, Kyongjun Yoo, B. Koteswararao, N. V. Ter-Oganessian, Kee Hoon Kim. 2023-04-29. Observation of linear magnetoelectric effect in a Dirac magnon antiferromagnet Cu$_3$TeO$_6$. https://arxiv.org/abs/2305.00215

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