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  4. Theory of the Field-Induced BEC in the Frustrated Spin-1/2 Dimer Compound BaCuSi2O6
 
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Theory of the Field-Induced BEC in the Frustrated Spin-1/2 Dimer Compound BaCuSi2O6

Laflorencie, Nicolas
•
Mila, Frederic
2009
Physical Review Letters

Building on recent neutron and NMR experiments, we investigate the field-induced exotic criticality observed in the frustrated compound BaCuSi2O6 using a frustrated model with two types of bilayers. A semiclassical treatment of the effective hard-core boson model shows that perfect interlayer frustration leads to a 2D-like critical exponent phi = 1 without logarithmic corrections and to a 3D low temperature phase with different but nonvanishing triplet populations in both types of bilayers. These further suggest a simple phenomenology in terms of a field-dependent transverse coupling in the context of which we reproduce the entire field-temperature phase diagram with quantum Monte Carlo simulations.

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PhysRevLett.102.060602.pdf

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http://purl.org/coar/version/c_970fb48d4fbd8a85

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openaccess

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51d5f93fdb563ea9e117817a01d36036

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