Bose-Einstein Condensation of Magnons in Cs{sub 2}CuCl{sub 4}
- Max-Planck-Institut fuer Chemische Physik fester Stoffe, Noethnitzer Strasse 40, 01187 Dresden (Germany)
- Max-Planck-Institut fuer Physik komplexer Systeme, Noethnitzer Strasse 38, 01187 Dresden (Germany)
- Oxford Physics, Clarendon Laboratory, Parks Road, Oxford OX1 3PU (United Kingdom)
- Institute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznan (Poland)
We report on results of specific heat measurements on single crystals of the frustrated quasi-2D spin-1/2 antiferromagnet Cs{sub 2}CuCl{sub 4} (T{sub N}=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 B{sub c}{approx_equal}8.51 T and a magnetic phase transition is clearly seen below B{sub c}. In the vicinity of B{sub c}, the phase transition boundary is well described by the power law T{sub c}(B){proportional_to}(B{sub c}-B){sup 1/{phi}}, with the measured critical exponent {phi}{approx_equal}1.5. These findings are interpreted as a Bose-Einstein condensation of magnons.
- OSTI ID:
- 20699443
- Journal Information:
- Physical Review Letters, Vol. 95, Issue 12; Other Information: DOI: 10.1103/PhysRevLett.95.127202; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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