Nuclear magnetic resonance evidence for a strong modulation of the Bose-Einstein condensate inBaCuSi2O6

2007/04/06 by S. Krämer, S. Kramer, Raivo Stern +6 · 1 citation
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.76.100406

published as Physical Review B 76, 10 (2007) 100406(R)

arxiv created 2007/04/06 · openalex publication_date 2007/09/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We present a ^63,65Cu and ²⁹Si NMR study of the quasi-2D coupled spin 1/2 dimer compound BaCuSi₂O₆ in the magnetic field range 13--26\phantom\rule0.3em0exT and at temperatures as low as 50\phantom\rule0.3em0exmK. NMR data in the gapped phase reveal that below 90\phantom\rule0.3em0exK different intradimer exchange couplings and different gaps (\ensuremathΔ_B∕\ensuremathΔ_A=1.16) exist in every second plane along the c axis, in addition to a planar incommensurate (IC) modulation. ²⁹Si spectra in the field induced magnetic ordered phase reveal that close to the quantum critical point at H_c1=23.35\phantom\rule0.3em0exT the average boson density n of the Bose-Einstein condensate is strongly modulated along the c axis with a density ratio for every second plane n_A∕n_B\ensuremath≃5. An IC modulation of the local density is also present in each plane.

Citations

• Field-Induced Staggered Magnetization and Magnetic Ordering inCu2(C5H12N2)2Cl4
• Observation of Bose-Einstein Condensation in a Dilute Atomic Vapor
• Consequences of spin-orbit coupling for the Bose-Einstein condensation of magnons
• Multiple Magnon Modes and Consequences for the Bose-Einstein Condensed Phase inBaCuSi2O6

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