Thermal and Magnetoelastic Properties of the van der Waals Ferromagnet Fe${}_{3-\delta }$GeTe${}_2$: Anisotropic Spontaneous Magnetostriction and Ferromagnetic Magnon Excitations

R. K. Kremer, E. Bruecher

By determining the lattice parameters as a function of temperature of the hexagonal van der Waals ferromagnet Fe${}_{2.92(1)}$Ge${}_{1.02(3)}$Te${}_2$ we obtain the temperature dependenc…