Journal
PHYSICAL REVIEW B
Volume 87, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.180405
Keywords
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Funding
- French ANR
- EuroMagNET network under EU [228043]
- Swiss National Fund
- MaNEP
- Estonian Research Council [ETF8440]
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In order to understand the nature of the two-dimensional Bose-Einstein condensed (BEC) phase in BaCuSi2O6, we performed detailed Cu-63 and Si-29 NMR above the critical magnetic field, H-c1 = 23.4 T. The two different alternating layers present in the system have very different local magnetizations close to H-c1; 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 Cu-63 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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