Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 27: Frustrated Magnets I

MA 27.7: Vortrag

Mittwoch, 20. März 2024, 16:30–16:45, H 2013

Investigation of the magnetoelectric and magnetoelastic properties of the quantum spin liquid candidate Na₂Co₂TeO₆ — •Vilmos Kocsis¹, Sven Luther², Nicolás Pérez¹, Weiliang Yao³, Hannes Kühne², Anja U. B. Wolter¹, Yuan Li³, and Bernd Büchner¹ — ¹IFW-Dresden, Dresden, Germany — ²HZDR, Dresden, Germany — ³Peking University, Bejing, China

Due to the promising features for quantum computing technologies, the exactly solvable Kitaev model with its bond-dependent interactions has attracted large attention in the scientific community. However, so far there is no such real crystalline material which provides a purely bond-dependent realization of the Kitaev model, as all candidate materials have significant exchange interactions and long-range magnetic order as a result. While these direct exchange interactions are undesirable, they also offer unique possibilities to suppress the long-range order. As an example, the magnetoelastic coupling in some Heisenberg-Kitaev magnets is suggested to be used to suppress the long-range AFM order via uniaxial stress. Here we discuss the magnetoelastic and magnetoelectric properties of the quantum spin liquid candidate Na₂Co₂TeO₆. We study the phase diagram of Na₂Co₂TeO₆ using thermodynamic, magnetic, magnetoelastic, and magnetoelectric measurements. We find strong magnetoelastic and moderate magnetoelectric response responses, magnetostriction is particularly strong for in-plane fields. We contemplate the possibility of using magnetoelectricity in Heisenberg-Kitaev magnets as a new, unique way to extinguish the unwanted long-range order.

Keywords: quantum spin liquids; multiferroics; magnetoelectricity; magnetoelasticity