Multiple Magnon Modes and Consequences for the Bose-Einstein Condensed Phase in BaCuSi2O6
Strongly Correlated Electrons
2008-04-24 v2
Abstract
The compound BaCuSi2O6 is a quantum magnet with antiferromagnetic dimers of S = 1/2 moments on a quasi-2D square lattice. We have investigated its spin dynamics by inelastic neutron scattering experiments on single crystals with an energy resolution considerably higher than in an earlier study. We observe multiple magnon modes, indicating clearly the presence of magnetically inequivalent dimer sites. This more complex spin Hamiltonian leads to a distinct form of magnon Bose-Einstein condensate (BEC) phase with a spatially modulated condensate amplitude.
Cite
@article{arxiv.cond-mat/0607465,
title = {Multiple Magnon Modes and Consequences for the Bose-Einstein Condensed Phase in BaCuSi2O6},
author = {Ch. Rüegg and D. F. McMorrow and B. Normand and H. M. Ronnow and S. E. Sebastian and I. R. Fisher and C. D. Batista and S. Gvasaliya and Ch. Niedermayer and J. Stahn},
journal= {arXiv preprint arXiv:cond-mat/0607465},
year = {2008}
}
Comments
5 pages, 4 figures, to be published in Phys. Rev. Lett