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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 Büchner11IFW-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

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