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Multiple magnon modes and consequences for the Bose-Einstein condensed phase in BaCuSi2O6

Ruegg, C; McMorrow, DF; Normand, B; Ronnow, HM; Sebastian, SE; Fisher, IR; Batista, CD; ... Stahn, J; + view all (2007) Multiple magnon modes and consequences for the Bose-Einstein condensed phase in BaCuSi2O6. PHYS REV LETT , 98 (1) , Article 017202. 10.1103/PhysRevLett.98.017202. Green open access

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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. The more complex spin Hamiltonian revealed in our study leads to a distinct form of magnon Bose-Einstein condensate phase with a spatially modulated condensate amplitude.

Type: Article
Title: Multiple magnon modes and consequences for the Bose-Einstein condensed phase in BaCuSi2O6
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.98.017202
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.98.017202
Language: English
Additional information: © 2007 The American Physical Society
Keywords: MAGNETIZATION PLATEAUS, GROUND-STATE, SPIN, SRCU2(BO3)(2), TEMPERATURE, TLCUCL3, FIELD, GAP
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/134602
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