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September 10, 2025Open Access

Direct probe of magnetic field effects on phonons by ultrasound propagation in the quasi-two-dimensional honeycomb magnet Na2Co2TeO6

Key Points

The study reveals strong spin-lattice coupling in the Co-based honeycomb magnet, demonstrated by sound velocity and attenuation.
Sound velocity was found to change significantly below the Néel temperature of 27 K, indicating ferrimagnetic order.
Data analysis supports a triple-Q ground state in the honeycomb magnet, linking phonons to magnetic properties.
Comparative analysis with thermal transport indicates significant contributions of phonons to observed behaviors.

Abstract

We study the phonon behavior of the Co-based honeycomb frustrated magnet Na2Co2TeO6 under a magnetic field applied perpendicular to the honeycomb plane. The temperature and field dependence of the sound velocity and sound attenuation unveil prominent spin-lattice coupling in this material, promoting ultrasound as a sensitive probe for magnetic properties. An out-of-plane ferrimagnetic order is determined below the Néel temperature TN=27 K. A comprehensive analysis of our data further supports a triple-Q ground state of Na2Co2TeO6. Furthermore, the ultrasound data were systematically compared to the thermal transport results from literature, to unveil the importance of the phononic contribution to the observed transport behaviors.

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