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Field induced magnetic phase transition as a magnon Bose Einstein condensation

Authors
Publisher
Elsevier Ltd
Publication Date
Volume
8
Issue
5
Identifiers
DOI: 10.1016/j.stam.2007.06.004
Keywords
  • Specific Heat
  • Quantum Critical Point
  • Bose–Einstein Condensation
Disciplines
  • Physics

Abstract

Abstract We report specific heat, magnetocaloric effect and magnetization measurements on single crystals of the frustrated quasi-2D spin - 1 2 antiferromagnet Cs 2 CuCl 4 in the external magnetic field 0 ⩽ B ⩽ 12 T along a -axis and in the temperature range 0.03 K ⩽ T ⩽ 6 K . Decreasing the applied magnetic field B from high fields leads to the closure of the field induced gap in the magnon spectrum at a critical field B c ≃ 8.44 T and a long-range incommensurate state below B c . In the vicinity of B c , the phase transition boundary is well described by the power law T N ∼ ( B c - B ) 1 / φ with the measured critical exponent φ ≃ 1.5 . These findings provide experimental evidence that the scaling law of the transition temperature T N can be described by the universality class of 3D Bose–Einstein condensation (BEC) of magnons.

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