Magnetic Superstructure in the Two-Dimensional Quantum Antiferromagnet SrCu2(BO3)2

Abstract

We report the observation of magnetic superstructure in a magnetization plateau state of SrCu2(BO3)2, a frustrated quasi-two-dimensional quantum spin system. The Cu and B nuclear magnetic resonance (NMR) spectra at 35 mllikelvin indicate an apparently discontinuous phase transition from uniform magnetization to a modulated superstructure near 27 tesla, above which a magnetization plateau at 1/8 of the full saturation has been observed. Comparison of the Cu NMR spectrum and the theoretical analysis of a Heisenberg spin model demonstrates the crystallization of itinerant triplets in the plateau phase within a large rhomboid unit cell (16 spins per layer) showing oscillations of the spin polarization. Thus we are now in possession of an interesting model system to study a localization transition of strongly interacting quantum particles.

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• Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials
• Magnetization plateaus in spin chains: ``Haldane gap'' for half-integer spins
• Exact dimer ground state of the two dimensional Heisenberg spin system SrCu_2(BO_3)_2
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• Direct Evidence for the Localized Single-Triplet Excitations and the Dispersive Multi-Triplets Excitations in SrCu2(BO3)2
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• Direct observation of the multiple spin gap excitations in two-dimensional dimer system SrCu2(BO3)2
• Dzyaloshinski-Moriya Interaction in the 2D Spin Gap System SrCu2(BO3)2
• Magnetization plateaus as insulator-superfluid transitions in quantum spin systems
• Magnetization plateaus of SrCu_2(BO_3)_2 from a Chern-Simons theory
• Y NMR imaging of the staggered magnetization in doped Haldane chain Y(2)BaNi(1-x)Mg(x)O(5)
• On the soliton width in the incommensurate phase of spin-Peierls systems
• Cu nuclear spin-spin coupling in the dimer singlet state in SrCu2(BO3)2

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