One-Dimensional Dispersive Magnon Excitation in the Frustrated Spin-2 Chain System Ca3Co2O6

Abstract

Using inelastic neutron scattering, we have observed a quasi-one-dimensional dispersive magnetic excitation in the frustrated triangular-lattice spin-2 chain oxide Ca3Co2O6. At the lowest temperature (T = 1.5 K), this magnon is characterized by a large zone-center spin gap of ~27 meV, which we attribute to the large single-ion anisotropy, and disperses along the chain direction with a bandwidth of ~3.5 meV. In the directions orthogonal to the chains, no measurable dispersion was found. With increasing temperature, the magnon dispersion shifts towards lower energies, yet persists up to at least 150 K, indicating that the ferromagnetic intrachain correlations survive up to 6 times higher temperatures than the long-range interchain antiferromagnetic order. The magnon dispersion can be well described within the predictions of linear spin-wave theory for a system of weakly coupled ferromagnetic chains with large single-ion anisotropy, enabling the direct quantitative determination of the magnetic exchange and anisotropy parameters.

7 pages, 6 figures including one animation

References in corpus (9)

• Valence, spin, and orbital state of the Co ions in the one-dimensional Ca3Co2O6: an x-ray absorption and magnetic circular dichroism study
• The nature of the magnetic order in Ca3Co2O6
• Unconventional Dynamics in Triangular Heisenberg Antiferromagnet NaCrO2
• Slow Magnetic Order-Order Transition in the Spin Chain Antiferromagnet Ca3Co2O6
• Formation of Magnetic Microphases in Ca${}_3$Co${}_2$O${}_6$
• Magnetodielectric coupling in a triangular Ising lattice
• An insight into spin-chain magnetism through Moessbauer spectroscopic investigations in Eu-doped Ca3Co2O6 and Ca3CoRhO6
• Anisotropic susceptibility of the geometrically frustrated spin-chain compound Ca3Co2O6
• Resonant X-ray scattering investigation of the multipolar ordering in Ca3Co2O6

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• Spin correlations in Ca3Co2O6: A polarised-neutron diffraction and Monte Carlo study
• Frustrated Ising chains on the triangular lattice in Sr${}_3$NiIrO${}_6$
• Non-collinear Order and Spin-Orbit Coupling in Sr${}_3$ZnIrO${}_6$
• Excitations in the spin-1 trimer chain compound CaNi3P4O14: gapped dispersive spinwaves to gapless magnetic excitations
• Peculiar magnetic dynamics across the in-field transition in Ca3Co2O6
• Time-of-flight elastic and inelastic neutron scattering studies on the localized $4d$ electron layered perovskite La${}_5$Mo${}_4$O${}_{16}$
• Magnetic ground state and excitations in mixed 3$d$-4$d$ quasi-1D spin-chain oxide Sr${}_3$NiRhO${}_6$