NMR evidence for a strong modulation of the Bose-Einstein Condensate in BaCuSi$_2$O$_6$

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dc.creatorKramer, S.
dc.creatorStern, R.
dc.creatorHorvatic, M.
dc.creatorBerthier, C.
dc.creatorKimura, T.
dc.creatorFisher, I. R.
dc.date2007-04-06
dc.date.accessioned2026-07-07T09:19:29Z
dc.date.available2026-07-07T09:19:29Z
dc.descriptionWe present a $^{63,65}$Cu and $^{29}$Si NMR study of the quasi-2D coupled spin 1/2 dimer compound BaCuSi$_2$O$_6$ 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 intra-dimer exchange couplings and different gaps ($Δ_{\rm{B}}/Δ_{\rm{A}}$ = 1.16) exist in every second plane along the c-axis, in addition to a planar incommensurate (IC) modulation. $^{29}$Si spectra in the field induced magnetic ordered phase reveal that close to the quantum critical point at $H_{\rm{c1}}$ = 23.35 T the average boson density $\bar{n}$ of the Bose-Einstein condensate is strongly modulated along the c-axis with a density ratio for every second plane $\bar{n}_{\rm{A}}/\bar{n}_{\rm{B}} \simeq 5$. An IC modulation of the local density is also present in each plane. This adds new constraints for the understanding of the 2D value $ϕ$ = 1 of the critical exponent describing the phase boundary.
dc.identifierhttps://arxiv.org/abs/0704.0888
dc.identifierhttp://arxiv.org/abs/0704.0888
dc.identifierPhysical Review B 76, 10 (2007) 100406(R)
dc.identifierdoi:10.1103/PhysRevB.76.100406
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/154405
dc.subjectStrongly Correlated Electrons
dc.titleNMR evidence for a strong modulation of the Bose-Einstein Condensate in BaCuSi$_2$O$_6$
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