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Spin and lattice are two fundamental degrees of freedom in a solid, and theirfluctuations about the equilibrium values in a magnetic ordered crystallinelattice form quasiparticles termed magnons (spin waves) and phonons (latticewaves), respectively. In most materials with strong spin-lattice coupling(SLC), the interaction of spin and lattice induces energy gaps in the spin wavedispersion at the nominal intersections of magnon and phonon modes. Here we useneutron scattering to show that in the two-dimensional (2D) van der Waalshoneycomb lattice ferromagnetic CrGeTe3, spin waves propagating within the 2Dplane exhibit an anomalous dispersion, damping, and break-down of quasiparticleconservation, while magnons along the c axis behave as expected for a localmoment ferromagnet. These results indicate the presence of dynamical SLCarising from the zero-temperature quantum fluctuations in CrGeTe3, suggestingthat the observed in-plane spin waves are mixed spin and lattice quasiparticlesfundamentally different from pure magnons and phonons.

Anisotropic magnon damping by zero-temperature quantum fluctuations in ferromagnetic CrGeTe$_3$