Spin dynamics of the quasi two dimensional spin-1/2 quantum magnet Cs_2CuCl_4

Abstract

We study dynamical properties of the anisotropic triangular quantum antiferromagnet Cs_2CuCl_4. Inelastic neutron scattering measurements have established that the dynamical spin correlations cannot be understood within a linear spin wave analysis. We go beyond linear spin wave theory by taking interactions between magnons into account in a 1/S expansion. We determine the dynamical structure factor and carry out extensive comparisons with experimental data. We find that compared to linear spin wave theory a significant fraction of the scattering intensity is shifted to higher energies and strong scattering continua are present. However, the 1/S expansion fails to account for the experimentally observed large quantum renormalization of the exchange energies.

arXiv comment13 pages, 11 figures, higher quality figures can be obtained from the authors

References in corpus (15)

• Experimental realization of a 2D fractional quantum spin liquid
• Observation of extended scattering continua characteristic of spin fractionalization in the 2D frustrated quantum magnet Cs2CuCl4 by neutron scattering
• Direct Measurement of the Spin Hamiltonian and Observation of Condensation of Magnons in the 2D Frustrated Quantum Magnet Cs2CuCl4
• High-energy magnon dispersion and multi-magnon continuum in the two-dimensional Heisenberg antiferromagnet
• Finite-temperature dynamical magnetic susceptibility of quasi-one-dimensional frustrated spin-1/2 Heisenberg antiferromagnets
• Instability of antiferromagnetic magnons in strong fields
• The Quasi-1D S=1/2 Antiferromagnet Cs2CuCl4 in a Magnetic Field
• Large-N solutions of the Heisenberg and Hubbard-Heisenberg models on the anisotropic triangular lattice: application to Cs${}_2$CuCl${}_4$ and to the layered organic superconductors $\kappa$-(BEDT-TTF)${}_2$X
• Spin-wave excitation spectra and spectral weights in square lattice antiferromagnets
• Ground states of a frustrated spin-1/2 antifferomagnet: Cs_2CuCl_4 in a magnetic field
• Static properties of a quasi one-dimensional antiferromagnet in magnetic field
• Statistics of spinons in the spin-liquid phase of Cs2CuCl4
• Finite-temperature perturbation theory for quasi-one-dimensional spin-1/2 Heisenberg antiferromagnets
• Antiferromagnetic Heisenberg model on anisotropic triangular lattice in the presence of magnetic field
• Spin wave theory for antiferromagnetic XXZ spin model on a triangle lattice in the presence of an external magnetic field

Cited by in corpus (35)

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• Unusual ordered phases of highly frustrated magnets: a review
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• Spinons and triplons in spatially anisotropic frustrated antiferromagnets
• Excitation spectra of the spin-1/2 triangular-lattice Heisenberg antiferromagnet
• Ordering in spatially anisotropic triangular antiferromagnets
• Extreme sensitivity of a frustrated quantum magnet: Cs_2CuCl_4
• Dynamical structure factor of triangular-lattice antiferromagnet
• Anomalous Excitation Spectra of Frustrated Quantum Antiferromagnets
• Flat spin wave dispersion in a triangular antiferromagnet
• Frustrated two dimensional quantum magnets
• Algebraic vortex liquid in spin-1/2 triangular antiferromagnets: Scenario for Cs_2CuCl_4
• Spin-lattice interaction in the quasi one-dimensional helimagnet LiCu_2O_2
• Field-induced decay dynamics in square-lattice antiferromagnet
• Theory of the algebraic vortex liquid in an anisotropic spin-1/2 triangular antiferromagnet
• Determination of effective microscopic models for the frustrated antiferromagnets Cs${}_2$CuCl${}_4$ and Cs${}_2$CuBr${}_4$ by density functional methods
• Magnetic order in coupled spin-half and spin-one Heisenberg chains in anisotropic triangular-lattice geometry
• "Quasi-particle breakdown" in the quasi-one-dimensional Ising ferromagnet CoNb${}_2$O${}_6$
• Spin Structure Factor of the Frustrated Quantum Magnet Cs_2CuCl_4
• Excitation spectra and ground state properties of the layered spin-1/2 frustrated antiferromagnets Cs_2CuCl_4 and Cs_2CuBr_4
• Elastic constants and ultrasonic attenuation in the cone state of the frustrated antiferromagnet Cs_2CuCl_4
• Quantum fluctuations in anisotropic triangular lattices with ferro- and antiferromagnetic exchange
• Hybridization and Decay of Magnetic Excitations in two-dimensional Triangular Lattice Antiferromagnets
• Raman scattering in a Heisenberg S=1/2 antiferromagnet on the anisotropic triangular lattice
• Critical spin liquid at 1/3 magnetization in a spin-1/2 triangular antiferromagnet
• Signatures of indirect K-edge resonant inelastic x-ray scattering on magnetic excitations in triangular lattice antiferromagnet
• Spin Casimir Effect in Non-collinear Quantum Antiferromagnets
• Magnetic excitations in the spin-1/2 triangular-lattice antiferromagnet Cs${}_2$CuBr${}_4$
• Commensurate and incommensurate ground states of Cs_2CuCl_4 in a magnetic field
• Magnetic phases of the anisotropic triangular lattice Hubbard model
• ${}^{133}$Cs NMR investigation of 2D frustrated Heisenberg antiferromagnet, Cs${}_2$CuCl${}_4$
• Torque equilibrium spin wave theory of Raman scattering in an anisotropic triangular lattice antiferromagnet with Dzyaloshinskii-Moriya interaction
• Singular spin-wave theory and scattering continua in the cone state of Cs_2CuCl_4
• Stabilizing the spiral order with spin-orbit coupling in an anisotropic triangular antiferromagnet
• Breakdown of the conventional spin-wave dynamics and its double-constraint modification in the spin-$\frac{1}{2}$ triangular-prism Heisenberg antiferromagnet