Characteristic BEC scaling close to Quantum Critical Point in BaCuSi2O6
强关联电子
2011-12-08 v2
摘要
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.
引用
@article{arxiv.cond-mat/0502374,
title = {Characteristic BEC scaling close to Quantum Critical Point in BaCuSi2O6},
author = {S. E. Sebastian and P. A. Sharma and M. Jaime and N. Harrison and V. Correa and L. Balicas and N. Kawashima and C. D. Batista and I. R. Fisher},
journal= {arXiv preprint arXiv:cond-mat/0502374},
year = {2011}
}
备注
4 pages, 3 figures; added reference