Dynamics of Bound Magnon Pairs in the Quasi-One-Dimensional Frustrated Magnet LiCuVO_4

Abstract

We report on the dynamics of the spin-1/2 quasi-one-dimensional frustrated magnet LiCuVO${}_4$ measured by nuclear spin relaxation in high magnetic fields 10--34 T, in which the ground state has spin-density-wave order. The spin fluctuations in the paramagnetic phase exhibit striking anisotropy with respect to the magnetic field. The transverse excitation spectrum probed by ${}^{51}$V nuclei has an excitation gap, which increases with field. On the other hand, the gapless longitudinal fluctuations sensed by ${}^7$Li nuclei grow with lowering temperature, but tend to be suppressed with increasing field. Such anisotropic spin dynamics and its field dependence agree with the theoretical predictions and are ascribed to the formation of bound magnon pairs, a remarkable consequence of the frustration between ferromagnetic nearest neighbor and antiferromagnetic next-nearest-neighbor interactions.

7 pages, 6 figures

References in corpus (15)

• Vector chiral and multipolar orders in the spin-1/2 frustrated ferromagnetic chain in magnetic field
• Emergent multipolar spin correlations in a fluctuating spiral - The frustrated ferromagnetic S=1/2 Heisenberg chain in a magnetic field
• Multi-magnon bound states in the frustrated ferromagnetic 1D chain
• New high magnetic field phase of the frustrated $S=1/2$ chain compound LiCuVO${}_4$
• Correlation functions and excitation spectrum of the frustrated ferromagnetic spin-1/2 chain in an external magnetic field
• Evidence of a bond-nematic phase in LiCuVO4
• Novel ordering of an S = 1/2 quasi one-dimensional Ising-like anitiferromagnet in magnetic field
• Search for a spin-nematic phase in the quasi-one-dimensional frustrated magnet LiCuVO${}_4$
• Spin-modulated quasi-1D antiferromagnet LiCuVO_4
• Spin-Nematic and Spin-Density-Wave Orders in Spatially Anisotropic Frustrated Magnets in a Magnetic Field
• NMR relaxation rate and dynamical structure factors in nematic and multipolar liquids of frustrated spin chains under magnetic fields
• Octupolar order in the multiple spin exchange model on a triangular lattice
• Field and temperature dependence of the NMR relaxation rate in the magnetic quadrupolar liquid phase of spin-1/2 frustrated ferromagnetic chains
• Ferroelectricity from spin supercurrents in LiCuVO4
• Magnetic Excitations of Spin Nematic State in Frustrated Ferromagnetic Chain

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• Spin nematics in frustrated spin-dimer systems with bilayer structure
• Elementary excitation in the spin-stripe phase in quantum chains
• Pressure-induced phase transition in the $J_1$-$J_2$ square lattice antiferromagnet RbMoOPO${}_4$Cl
• Dynamics of quantum spin-nematics: Comparisons with canted antiferromagnets