Evidence for magnon-phonon coupling in the topological magnet Cu${}_3$TeO${}_6$

Abstract

We perform thermodynamic and inelastic neutron scattering (INS) measurements to study the lattice dynamics (phonons) of a cubic collinear antiferromagnet Cu${}_3$TeO${}_6$ which hosts topological spin excitations (magnons). While the specific heat and thermal conductivity results show that the thermal transport is dominated by phonons, the deviation of the thermal conductivity from a pure phononic model indicates that there is a strong coupling between magnons and phonons. In the INS measurements, we find a mode in the excitation spectra at 4.5 K, which exhibits a slight downward dispersion around the Brillouin zone center. This mode disappears above the Néel temperature, and thus cannot be a phonon. Furthermore, the dispersion is distinct from that of a magnon. Instead, it can be explained by the magnon-polaron mode, which is new collective excitations resulting from the hybridization between magnons and phonons. We consider the suppression of the thermal conductivity and emergence of the magnon-polaron mode to be evidence for magnon-phonon coupling in Cu${}_3$TeO${}_6$.

9 pages, 4 figures, formula Cu3TeO6 updated in the title and abstract

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Cited by in corpus (12)

• Topological magnon insulator spin excitations in the two-dimensional ferromagnet CrBr${}_3$
• Large Phonon Thermal Hall Conductivity in a Simple Antiferromagnetic Insulator
• Direct observation of topological magnon polarons in a multiferroic material
• Hybrid topological magnon-phonon modes in honeycomb and kagome lattices
• Diagonal and off-diagonal thermal conduction with resonant phonon scattering in $N{i}_{3}Te{O}_6$
• Coherent strong-coupling of terahertz magnons and phonons in a Van der Waals antiferromagnetic insulator
• Exchange striction induced thermal Hall effect in van der Waals antiferromagnet MnPS${}_3$
• Chiral phonons induced from spin dynamics via magnetoelastic anisotropy
• Spin-Reorientation-Driven Linear Magnetoelectric Effect in Topological Antiferromagnet Cu${}_3$TeO${}_6$
• Unusual spin pseudogap behavior in the spin web lattice Cu${}_3$TeO${}_6$ probed by ${}^{125}$Te nuclear magnetic resonance
• Topological characterization of magnon-polaron bands and thermal Hall conductivity in a frustrated kagome antiferromagnet
• Inelastic Neutron Scattering for Direct Detection of Chiral Phonons