Spatially Resolved Magnetization in the Bose-Einstein Condensed State of BaCuSi2O6: Evidence for Imperfect Frustration

Abstract

In order to understand the nature of the two-dimensional Bose-Einstein condensed (BEC) phase in BaCuSi2O6, we performed detailed 63Cu and 29Si NMR above the critical magnetic field, Hc1= 23.4 T. The two different alternating layers present in the system have very different local magnetizations close to Hc1; one is very weak, and its size and field dependence are highly sensitive to the nature of inter-layer coupling. Its precise value could only be determined by "on-site" 63Cu NMR, and the data are fully reproduced by a model of interacting hard-core bosons in which the perfect frustration associated to tetragonal symmetry is slightly lifted, leading to the conclusion that the population of the less populated layers is not fully incoherent but must be partially condensed.

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• Dimensional reduction at a quantum critical point
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• Theory of the field-induced BEC in the frustrated spin-1/2 dimer compound BaCuSi2O6
• NMR evidence for a strong modulation of the Bose-Einstein Condensate in BaCuSi${}_2$O${}_6$
• Quantum phase transitions and dimensional reduction in antiferromagnets with inter-layer frustration
• Reduced dimensionality in layered quantum dimer magnets: Frustration vs. inhomogeneous condensates
• Two types of adjacent dimer layers in the low temperature phase of BaCuSi2O6

Cited by in corpus (10)

• Magnetic frustration in BaCuSi2O6 released
• Bose glass transition and spin-wave localization for 2D bosons in a random potential
• Nuclear Magnetic Resonance in High Magnetic Field: Application to Condensed Matter Physics
• Revealing three-dimensional quantum criticality by Sr-substitution in Han Purple
• Multiple Magnetic Bilayers and Unconventional Criticality without Frustration in BaCuSi${}_2$O${}_6$
• Detection of a Disorder-Induced Bose-Einstein Condensate in a Quantum Spin Material at High Magnetic Fields
• NMR, magnetization, and heat capacity studies of the uniform spin-1/2 chain compound Bi6V3O16
• Breaking the chains: extreme value statistics and localization in random spin chains
• Stabilization of the tetragonal structure in (Ba${}_{1-x}$Sr${}_x$)CuSi${}_2$O${}_6$
• Investigating field-induced magnetic order in Han Purple by neutron scattering up to 25.9 T