Multiple Magnon Modes and Consequences for the Bose-Einstein Condensed Phase in BaCuSi2O6

Details Multiple Magnon Modes and Consequences for the Bose-Einstein Condensed Phase in BaCuSi2O6 Multiple Magnon Modes and Consequences for the Bose-Einstein Condensed Phase in BaCuSi2O6

2006-07-19

arxiv.org/abs/cond-mat/0607465v2

Phys. Rev. Lett. 98, 017202 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.98.017202

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.

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