Collective Singlet Excitations and Evolution of Raman Spectral Weights in the 2D Spin Dimer Compound SrCu2(BO3)2

Abstract

We present a Raman light scattering study of the two-dimensional quantum spin system SrCu2(BO3)2 and show that the magnetic excitation spectrum has a rich structure, including several well-defined bound state modes at low temperature, and a scattering continuum and quasielastic light scattering contributions at high temperature. The key to the understanding of the unique features of SrCu2(BO3)2 is the presence of strong interactions between well-localized triplet excitations in the network of orthogonal spin dimers realized in this compound. Based on our analysis of the Heisenberg model relevant for this material, we argue that the collective excitations involving two and three-particle singlet bound states have large binding energies and are observed as well-defined peaks in the Raman spectrum.

5 pages, 2 figures. Revised version, to appear in Phys. Rev. Lett. (2000)

References in corpus (13)

• Exact dimer ground state of the two dimensional Heisenberg spin system SrCu_2(BO_3)_2
• Direct Evidence for the Localized Single-Triplet Excitations and the Dispersive Multi-Triplets Excitations in SrCu2(BO3)2
• Magnetic excitation spectrum of dimerized antiferromagnetic chains
• Direct observation of the multiple spin gap excitations in two-dimensional dimer system SrCu2(BO3)2
• Exact Demonstration of Magnetization Pleateaus and First Order Dimer-Néel Phase Transitions in a Modified Shastry-Sutherland Model for SrCu${}_2$(BO${}_3$)${}_2$
• Various series expansions for a Heisenberg antiferromagnet model for SrCu${}_2$(BO${}_3$)${}_2$
• Resonant two-magnon Raman scattering in parent compounds of high-T${}_c$ superconductors.
• Elementary Excitations in Dimerized and Frustrated Heisenberg Chains
• Excitation spectrum of the S=1/2 quantum spin ladder with frustration: elementary quasiparticles and many-particle bound states
• Frustration induced Raman scattering in CuGeO_3
• Magnetic bound states in the quarter-filled ladder system ${\alpha }^{\prime }-Na{V}_2{O}_5$}
• Observation of three-magnon light scattering in CuGeO_3
• Magnetic Bound States in Dimerized Quantum Spin Systems

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• Interplay of thermal and quantum spin fluctuations on the kagome lattice
• Evidence for an unconventional magnetic instability in the spin-tetrahedra system Cu_2Te_2O_5Br_2
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• Magnetism of a tetrahedral cluster spin-chain
• A Novel Ordered Phase in SrCu2(BO3)2 under High Pressure
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• Investigation of the oxohalogenide Cu4Te5O12Cl4 with weakly coupled Cu(II) tetrahedra
• Theory of spin density profile in the magnetization plateaus of SrCu_2(BO_3)_2
• X-Band ESR Determination of Dzyaloshinsky-Moriya Interaction in 2D SrCu${}_2$(BO${}_3$)${}_2$ System
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• Far-infrared spectroscopy of spin excitations and Dzyaloshinskii-Moriya interactions in a Shastry-Sutherland compound SrCu${}_2$(BO${}_3$)$_2
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• Two-triplon excitations of the Kitaev-Heisenberg-Bilayer
• Theory of the Raman spectra of the Shastry-Sutherland antiferromagnet SrCu${}_2$(BO${}_3$)${}_2$ doped with nonmagnetic impurities
• Numerical Study of Excited States in the Shastry-Sutherland Model
• Emergence of a Dimer-Dimer Interaction in the Low-Energy Effective Quantum-Dimer Model of a Diamond-Like-Decorated Square-Lattice Heisenberg Antiferromagnets with Further Neighbor Couplings
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