Bose-Einstein Condensation of Magnons in Cs2CuCl4
Abstract
We report on results of specific heat measurements on single crystals of the frustrated quasi-2D spin-1/2 antiferromagnet Cs2CuCl4 (TN=0.595 K) in external magnetic fields B<12 T and for temperatures T>30 mK. Decreasing B from high fields leads to the closure of the field-induced gap in the magnon spectrum at a critical field Bc = 8.51 T and a magnetic phase transition is clearly seen below Bc. In the vicinity to Bc, the phase transition boundary is well described by the power-law Tc(B) (Bc-B)1/φ with the measured critical exponent φ 1.5. These findings are interpreted as a Bose-Einstein condensation of magnons.
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