Field-Induced Bose-Einstein Condensation of Triplons up to 8 K inSr3Cr2O8 Academic Article uri icon

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abstract

  • Single crystals of the spin dimer system Sr(3)Cr(2)O(8) have been grown for the first time. Magnetization, heat capacity, and magnetocaloric effect data up to 65 T reveal magnetic order between applied fields of H(c1) approximately 30.4 T and H(c2) approximately 62 T. This field-induced order persists up to T(c)(max) approximately 8 K at H approximately 44 T, the highest observed in any quantum magnet where H(c2) is experimentally accessible. We fit the temperature-field phase diagram boundary close to H(c1) using the expression T(c) = A(H-H(c1))(nu). The exponent nu = 0.65(2), obtained at temperatures much smaller than T(c)(max), is that of the 3D Bose-Einstein condensate (BEC) universality class. This finding strongly suggests that Sr(3)Cr(2)O(8) is a new realization of a triplon BEC where the universal regimes corresponding to both H(c1) and H(c2) are accessible at (4)He temperatures.

authors

  • Aczel, AA
  • Kohama, Y
  • Marcenat, C
  • Weickert, F
  • Jaime, M
  • Ayala-Valenzuela, OE
  • McDonald, RD
  • Selesnic, SD
  • Dabkowska, HA
  • Luke, Graeme

publication date

  • November 13, 2009