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Nuclear magnetic resonance evidence for a strong modulation of the Bose-Einstein condensate in BaCuSi2O6

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Kramer,  S.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Horvatić,  M.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Berthier,  C.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Kramer, S., Stern, R., Horvatić, M., Berthier, C., Kimura, T., & Fisher, R. (2007). Nuclear magnetic resonance evidence for a strong modulation of the Bose-Einstein condensate in BaCuSi2O6. Physical Review B, 76(10): 100406.


Cite as: https://hdl.handle.net/21.11116/0000-000E-B451-B
Abstract
We present a Cu-63,Cu-65 and Si-29 NMR study of the quasi-2D coupled spin 1/2 dimer compound BaCuSi2O6 in the magnetic field range 13-26 T and at temperatures as low as 50 mK. NMR data in the gapped phase reveal that below 90 K different intradimer exchange couplings and different gaps (Delta(B)/Delta(A)=1.16) exist in every second plane along the c axis, in addition to a planar incommensurate (IC) modulation. Si-29 spectra in the field induced magnetic ordered phase reveal that close to the quantum critical point at H-c1=23.35 T the average boson densityn of the Bose-Einstein condensate is strongly modulated along the c axis with a density ratio for every second plane n(A)n(B)similar or equal to 5. An IC modulation of the local density is also present in each plane.