Characteristic BEC scaling close to Quantum Critical Point in BaCuSi2O6

Details Characteristic BEC scaling close to Quantum Critical Point in BaCuSi2O6 Characteristic BEC scaling close to Quantum Critical Point in BaCuSi2O6

2005-02-16

arxiv.org/abs/cond-mat/0502374v2

Phys. Rev. B 72, 100404(R) (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures; added reference

Scientific paper

10.1103/PhysRevB.72.100404

We report an experimental determination of the phase boundary between a quantum paramagnetic state and the proposed spin Bose-Einstein condensate of triplons in the spin gap compound BaCuSi2O6. The ordering temperature is related to the proximity to a quantum critical point at the lower critical magnetic field H_c1 = 23.52 +/- 0.03T by a power law parameterized by critical exponent nu. We obtain an experimental estimate of nu = 0.63 +/- 0.03 which is in good agreement with the mean field prediction of nu = 2/3 for the 3D XY model, used to describe the Bose condensation of a 3D dilute interacting Bose gas.

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