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

K Kodama, M Takigawa, M Horvatic, C Berthier… - Science, 2002 - science.org
K Kodama, M Takigawa, M Horvatic, C Berthier, H Kageyama, Y Ueda, S Miyahara, F Becca
Science, 2002science.org
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 millikelvin 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 …
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 millikelvin 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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