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Science 11 October 2002: Vol. 298. no. 5592, pp. 395 - 399 DOI: 10.1126/science.1075045
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Reports
Magnetic Superstructure in the Two-Dimensional Quantum Antiferromagnet SrCu2(BO3)2
K. Kodama,1
M. Takigawa,1*
M. Horvati ,2
C. Berthier,23
H. Kageyama,1
Y. Ueda,1
S. Miyahara,14
F. Becca,4
F. Mila4
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.
1 Institute for Solid State Physics, University
of Tokyo, Kashiwa, Chiba 277-8581, Japan.
2 Grenoble
High Magnetic Field Laboratory, CNRS and MPI-FKF, 38042 Grenoble,
France.
3 Laboratoire de Spectrométrie
Physique, Université Joseph Fourier Grenoble I, 38402 St.-Martin
d'Hères, France.
4 Institut de Physique
Théorique, Université de Lausanne, CH-1015 Lausanne,
Switzerland.
*
To whom correspondence should be addressed. E-mail:
masashi{at}issp.u-tokyo.ac.jp
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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
- Fractalization drives crystalline states in a frustrated spin system.
- S. E. Sebastian, N. Harrison, P. Sengupta, C. D. Batista, S. Francoual, E. Palm, T. Murphy, N. Marcano, H. A. Dabkowska, and B. D. Gaulin (2008)
PNAS
105, 20157-20160
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