Direct probe of magnetic field effects on phonons by ultrasound propagation in a quasi-two-dimensional honeycomb magnet Na2Co2TeO6
Abstract
We study the phonon behavior of a Co-based honeycomb frustrated magnet Na2Co2TeO6 under 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 N\'eel 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 phononic contribution to the observed transport behaviors.
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