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arXiv · 2102.00994

Magnetoelectric spectroscopy of spin excitations in LiCoPO4

Vilmos Kocsis·Sándor Bordács·Yusuke Tokunaga·Johan Viirok·Laur Peedu·Toomas Rõõm·Urmas Nagel·Yasujiro Taguchi·Yoshinori Tokura·István Kézsmárki
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Abstract

We have studied spin excitations in a single-domain crystal of antiferromagnetic LiCoPO4 by THz absorption spectroscopy. By analyzing the selection rules and comparing the strengths of the absorption peaks in the different antiferromagnetic domains, we found electromagnons and magnetoelectric spin resonances besides conventional magnetic-dipole active spin-wave excitations. Using the sum rule for the magnetoelectric susceptibility we determined the contribution of the spin excitations to all the different off-diagonal elements of the static magnetoelectric susceptibility tensor in zero as well as in finite magnetic fields. We conclude that the magnetoelectric spin resonances are responsible for the static magnetoelectric response of the bulk when the magnetic field is along the x-axis, and the symmetric part of the magnetoelectric tensor with zero diagonal elements dominates over the antisymmetric components.

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Vilmos Kocsis, Sándor Bordács, Yusuke Tokunaga, Johan Viirok, Laur Peedu, Toomas Rõõm, Urmas Nagel, Yasujiro Taguchi, Yoshinori Tokura, István Kézsmárki. 2021-02-01. Magnetoelectric spectroscopy of spin excitations in LiCoPO4. https://doi.org/10.1103/physrevb.100.155124

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