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MA: Fachverband Magnetismus
MA 27: Frustrated Magnets I
MA 27.1: Talk
Wednesday, March 20, 2024, 15:00–15:15, H 2013
Spin-wave dynamics in rouaite, Cu2(NO3)(OD)3 — •Dmytro S. Inosov1, Aswathi M. Chakkingal1, Anton A. Kulbakov1, J. Ross Stewart2, and Darren C. Peets1 — 1Institut für Festkörper- und Materialphysik, Fakultät Physik, TU Dresden — 2ISIS neutron source, Rutherford Appleton Laboratory, UK
Cu2(NO3)(OH)3 (mineral name: rouaite) is a quasi-1D quantum spin system with structural similarity to botallackite, in which spinon-magnon mixing has recently been reported by H. Zhang et al. [Phys. Rev. Lett. 125 (2020), 037204]. It contains highly distorted triangular-lattice layers composed of alternating ferro- and antiferromagnetic spin-1/2 chains. The magnetic excitation spectrum of synthetic deuterated Cu2(NO3)(OD)3 single crystals, measured by inelastic neutron scattering, reveals collective excitations with magnon bandwidths of ∼11, 1.3 and 0.05 meV in the intrachain, interchain and interlayer directions, respectively, and a spin gap of 0.2 meV. This suggests a hierarchy of exchange interactions at the boundary between quasi-1D and quasi-2D spin systems: While interchain interactions are apparently sufficient to suppress the spinon continuum, some spin-wave branches still show anomalous broadening, reminiscent of the fractionalized behavior in 1D spin chains.
Keywords: frustrated low-dimensional magnets; fractionalized spin excitations; spinons; quantum spin chains; inelastic neutron scattering