Role of anisotropy in the spin-dimer compound BaCuSi2O6
- We present results of magnetization and electron paramagnetic resonance experiments on the spin-dimer system BaCu Si2 O6. Evidence indicates that the origin of anisotropic terms in the spin Hamiltonian lies in magnetic dipolar interactions. Axial symmetry breaking is on a very small energy scale of ≤11 mK, confirming Bose-Einstein condensation critical scaling over an extended temperature range in the vicinity of the quantum critical point. © 2006 The American Physical Society.
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