Role of anisotropy in the spin-dimer compound BaCuSi2O6
arXiv:cond-mat/0606244 · doi:10.1103/PhysRevB.74.180401
Abstract
We present results of magnetisation and electron paramagnetic resonance experiments on the spin-dimer system BaCuSi2O6. Evidence indicates that the origin of anisotropic terms in the spin Hamiltonian is from 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.
4 pages, 4 figures