Characteristic BEC scaling close to Quantum Critical Point in BaCuSi2O6

C. D. Batista; I. R. Fisher; L. Balicas; M. Jaime; N. Harrison; N. Kawashima; P. A. Sharma; S. E. Sebastian; V. Correa

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Characteristic BEC scaling close to Quantum Critical Point in BaCuSi2O6

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arxiv cond-mat/0502374 v2 pith:UY4W5MDJ submitted 2005-02-16 cond-mat.str-el

Characteristic BEC scaling close to Quantum Critical Point in BaCuSi2O6

S. E. Sebastian , P. A. Sharma , M. Jaime , N. Harrison , V. Correa , L. Balicas , N. Kawashima , C. D. Batista

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I. R. Fisher

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keywords criticalquantumbacusi2o6boseexperimentalfieldpointspin

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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.

Characteristic BEC scaling close to Quantum Critical Point in BaCuSi2O6

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