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Characteristic Bose-Einstein condensation scaling close to a quantum critical point in BaCuSi2O6

S. E. Sebastian, P. A. Sharma, M. Jaime, N. Harrison, V. Correa, L. Balicas, N. Kawashima, C. D. Batista, and I. R. Fisher
Phys. Rev. B 72, 100404(R) – Published 30 September 2005

Abstract

We report an experimental determination of the phase boundary approaching the quantum critical point separating a quantum paramagnetic state and the proposed spin Bose-Einstein condensate of triplons in the spin dimer compound BaCuSi2O6. The ordering temperature is related to the proximity to a quantum critical point at the lower critical magnetic field Hc1=23.52±0.03T by a power law parametrized by critical exponent ν. We obtain an experimental estimate of ν=0.63±0.03 down to a temperature of 0.61 K, which is in good agreement with the mean-field prediction of ν=23 for the three-dimensional Bose-Einstein condensation universality class.

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  • Received 5 August 2005

DOI:https://doi.org/10.1103/PhysRevB.72.100404

©2005 American Physical Society

Authors & Affiliations

S. E. Sebastian1, P. A. Sharma2, M. Jaime2, N. Harrison2, V. Correa2, L. Balicas3, N. Kawashima4, C. D. Batista5, and I. R. Fisher1

  • 1Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, Stanford, California 94305, USA
  • 2MST-NHMFL, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 3National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
  • 4Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • 5Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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Issue

Vol. 72, Iss. 10 — 1 September 2005

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