Multiple Magnon Modes and Consequences for the Bose-Einstein Condensed Phase in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>BaCuSi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:math>
Christian RüeggLondon Centre for Nanotechnology, Department of Physics and Astronomy, University College London, London, UKD. F. McMorrowISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United KingdomB. NormandInstitute of Theoretical Physics, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, SwitzerlandH. M. RønnowLaboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, 5232 Villigen PSI, SwitzerlandSuchitra E. SebastianGeballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, Stanford, California 94305, USAI. R. FisherGeballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, Stanford, California 94305, USACristian D. BatistaTheoretical Division and MST-NHMFL, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USAS. N. GvasaliyaLaboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, 5232 Villigen PSI, SwitzerlandCh. NiedermayerLaboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, 5232 Villigen PSI, SwitzerlandJochen StahnLaboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
2007lv
ABI
Аннотация
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.
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