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APS » Journals » Phys. Rev. Lett. » Volume 93 » Issue 26
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Phys. Rev. Lett. 93, 267202 (2004) [4 pages]

High-Resolution Study of Spin Excitations in the Singlet Ground State of SrCu2(BO3)2

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B. D. Gaulin1,2, S. H. Lee3, S. Haravifard1, J. P. Castellan1, A. J. Berlinsky1,2, H. A. Dabkowska1, Y. Qiu3,4, and J. R. D. Copley3
1Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada
2Canadian Institute for Advanced Research, 180 Dundas Street W., Toronto, Ontario M5G 1Z8, Canada
3National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899-8562, USA
4Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA

Received 21 January 2004; published 21 December 2004

High-resolution, inelastic neutron scattering measurements on SrCu2(BO3)2, a realization of the Shastry-Sutherland model for two-dimensional Heisenberg antiferromagnets, reveal the dispersion of the three single triplet excitations continuously across the (H,0) direction within its tetragonal basal plane. These measurements also show distinct Q dependencies for the single and multiple triplet excitations, and that these excitations are largely dispersionless perpendicular to this plane. The temperature dependence of the intensities of these excitations is well described as the complement of the dc susceptibility of SrCu2(BO3)2.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.267202
DOI:
10.1103/PhysRevLett.93.267202
PACS:
75.10.Jm, 75.25.+z, 75.40.Gb
 
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