Magnon-phonon coupling and two-magnon continuum in two-dimensional triangular antiferromagnet CuCrO2

Abstract

CuCrO2 is a manifestation of a two-dimensional triangular antiferromagnet which exhibits an incommensurate noncollinear magnetic structure similar to a classical 120 degree ordering. Using the inelastic neutron scattering technique, direct evidence of a magnon-phonon coupling in CuCrO2 is revealed via the mixed magnon-phonon character of the excitation mode at 12.5 meV as well as a minimum at the zone boundary. A simple model Hamiltonian that incorporates an exchange striction type magnon-phonon coupling reproduces the observed features accurately. Also, continuum excitations originating from the interaction between quasiparticles are observed with strong intensity at the zone boundary. These features of the magnetic excitations are key to an understanding of the emergent excitations in noncollinear antiferromagnetic compounds.

6 pages, 4 figures, Physical Review B accepted

References in corpus (16)

• Spin-driven ferroelectricity and possible antiferroelectricity in triangular lattice antiferromagnets ACrO2 (A = Cu, Ag, Li, or Na)
• Spontaneous Magnon Decays
• Spin-waves in triangular lattice antiferromagnet: decays, spectrum renormalization, and singularities
• Dynamical structure factor of triangular-lattice antiferromagnet
• Anomalous Excitation Spectra of Frustrated Quantum Antiferromagnets
• Raman scattering study of delafossite magnetoelectric multiferroic compounds: CuFeO2 and CuCrO2
• Quasiparticle breakdown in a quantum spin liquid
• Spin dynamics in the geometrically frustrated multiferroic CuCrO2
• Mechanisms of degeneracy breaking in pyrochlore antiferromagnets
• Magnon breakdown in a two dimensional triangular lattice Heisenberg antiferromagnet of multiferroic LuMnO${}_3$
• Magnetic excitations in the geometric frustrated multiferroic CuCrO${}_2$
• Multiferroic CuCrO2 under High Pressure: In-Situ X-Ray Diffraction and Raman Spectroscopic Studies
• Magnetic structure of CuCrO2: a single crystal neutron diffraction study
• Lattice-coupled Antiferromagnet on Frustrated Lattices
• Coupling of phonons and spin waves in triangular antiferromagnet
• Development of spin correlations in the geometrically frustrated triangular-lattice Heisenberg antiferromagnet CuCrO2

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