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Phys. Rev. Lett. 95, 127202 (2005) [4 pages]

Bose-Einstein Condensation of Magnons in Cs2CuCl4

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T. Radu1, H. Wilhelm1, V. Yushankhai1,2, D. Kovrizhin3, R. Coldea4, Z. Tylczynski5, T. Lühmann1, and F. Steglich1
1Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Strasse 40, 01187 Dresden, Germany
2Laboratory of Theoretical Physics, JINR, 141980 Dubna, Russia
3Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Strasse 38, 01187 Dresden, Germany
4Oxford Physics, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom
5Institute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznan, Poland

Received 3 May 2005; published 14 September 2005

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 of 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.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.127202
DOI:
10.1103/PhysRevLett.95.127202
PACS:
75.40.−s, 03.75.Nt, 75.30.Kz, 75.45.+j

See Also

Comment: S. E. Sebastian, V. S. Zapf, N. Harrison, C. D. Batista, P. A. Sharma, M. Jaime, I. R. Fisher, and A. Lacerda, Comment on “Bose-Einstein Condensation of Magnons in Cs2CuCl4”, Phys. Rev. Lett. 96, 189703 (2006).

Comment: D. L. Mills, Comment on “Bose-Einstein Condensation of Magnons in Cs2CuCl4”, Phys. Rev. Lett. 98, 039701 (2007).

Reply: T. Radu, H. Wilhelm, V. Yushankhai, D. Kovrizhin, R. Coldea, Z. Tylczynski, T. Lühmann, and F. Steglich, Radu et al. Reply:, Phys. Rev. Lett. 96, 189704 (2006).

Reply: T. Radu, H. Wilhelm, V. Yushankhai, D. Kovrizhin, R. Coldea, Z. Tylczynski, T. Lühmann, and F. Steglich, Radu et al. Reply:, Phys. Rev. Lett. 98, 039702 (2007).

 
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