Far infrared study of the two dimensional dimer spin system SrCu_2(BO_3)_2

Abstract

Using far-infrared spectroscopy in magnetic fields up to 12T we have studied a two-dimensional dimer spin gap system SrCu_2(BO_3)_2. We found several infrared active modes in the dimerized state (below 10K) in the frequency range from 3 to 100cm^-1. The measured splitting from the ground state to the excited triplet M_S=0 sublevel is Delta_1=24.2cm^-1 and the other two triplet state sublevels in zero magnetic field are 1.4cm^-1 below and above the M_S=0 sublevel. Another multiplet is at Delta_2=37.6cm^-1 from the ground state. A strong electric dipole active transition polarized in the (ab)-plane is activated in the dimer spin system below 15K at 52cm^-1.

4 pages including 5 figures, submitted to PRB, instrumental arte facts removed

References in corpus (4)

• Exact dimer ground state of the two dimensional Heisenberg spin system SrCu_2(BO_3)_2
• 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${}_3$)${}_2$

Cited by in corpus (27)

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• Dzyaloshinski-Moriya Interaction in the 2D Spin Gap System SrCu2(BO3)2
• ESR study on the excited state energy spectrum of SrCu${}_2$(BO${}_3$)${}_2$ -a central role of multiple-triplet bound states
• Low-Lying Magnetic Excitation of the Shastry-Sutherland Model
• The effect of Dzyaloshinskii-Moriya interactions on the phase diagram and magnetic excitations of SrCu2(BO3)2
• Dynamics and Instabilities of the Shastry-Sutherland Model
• 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
• High Field Specific Heat of 2D Quantum Spin System SrCu2(BO3)2
• Far-infrared spectroscopy of spin excitations and Dzyaloshinskii-Moriya interactions in a Shastry-Sutherland compound SrCu${}_2$(BO${}_3$)$_2
• Ground-State Phase Diagram for the Three-Dimensional Orthogonal-Dimer System
• Magnon Dispersion and Anisotropies in SrCu${}_2$(BO${}_3$)${}_2$
• Symmetry and light coupling to phononic and collective magnetic excitations in SrCu_2(BO_3)_2
• Theory of phonon-assisted "forbidden" optical transitions in spin-gapped systems
• Symmetries and Triplet Dispersion in a Modified Shastry-Sutherland Model for SrCu_2(BO_3)_2
• Ultrafast Frustration-Breaking and Magnetophononic Driving of Singlet Excitations in a Quantum Magnet
• Frequency Extension to THz Range in High Pressure ESR System and Its Application to Shastry-Sutherland Model Compound SrCu${}_2$(BO${}_3$)${}_2$
• Electron Spin Resonance of SrCu2(BO3)2 at High Magnetic Field
• Dzyaloshinskii-Moriya interaction in NaV${}_2$O${}_5$: a microscopic study
• Collective Magnetic Excitations in SrCu_2(BO_3)_2
• Numerical Study of Excited States in the Shastry-Sutherland Model
• Multi-Triplet Magnons in SrCu${}_2$(BO${}_3$)${}_2$ Studied by Thermal Conductivity Measurements in Magnetic Fields
• Instability of isolated triplet excitations on the Shastry-Sutherland lattice (SSL)
• Anomalous thermal broadening in the Shastry-Sutherland model and SrCu${}_2($BO${}_3{)}_2$
• SrCu_2(BO_3)_2 - a Two Dimensional Spin Liquid