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26 April 2024 |
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Magnetic Superstructure in the Two-Dimensional Quantum Antiferromagnet SrCu2(BO3)2 | | K. Kodama
; M. Takigawa
; M. Horvatic
; C. Berthier
; H. Kageyama
; Y. Ueda
; S. Miyahara
; F. Becca
; F. Mila
; | | Date: |
14 Oct 2002 | | Journal: | Science vol. 298, page 395, year 2002 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Affiliation: | 2,3), H. Kageyama , Y. Ueda , S. Miyahara (1,4), F. Becca , and F. Mila ( ISSP, University of Tokyo, GHMFL, Grenoble, Universite Joseph Fourier, Grenoble, IPT, Universite de Lausanne | | 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. | | Source: | arXiv, cond-mat/0210294 | | Services: | Forum | Review | PDF | Favorites | |
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