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 Cs_2CuCl_4 (T_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_c = 8.51 T and a magnetic phase transition is clearly seen below B_c. In the vicinity to B_c, the phase transition boundary is well described by the power-law T_c(B)\propto (B_c-B)^{1/ϕ} with the measured critical exponent ϕ\simeq 1.5. These findings are interpreted as a Bose-Einstein condensation of magnons.

5 pages, 4 figures, experiment and theory

References in corpus (8)

• Realization of Bose-Einstein condensation of dilute magnons in TlCuCl${}_3$
• Experimental realization of a 2D fractional quantum spin liquid
• Coupled Ladders in a Magnetic Field
• Direct Measurement of the Spin Hamiltonian and Observation of Condensation of Magnons in the 2D Frustrated Quantum Magnet Cs2CuCl4
• The spin-1/2 Heisenberg chain: thermodynamics, quantum criticality and spin-Peierls exponents
• Universal scaling at field-induced magnetic phase transitions
• Ground states of a frustrated spin-1/2 antifferomagnet: Cs_2CuCl_4 in a magnetic field
• Dynamics of anisotropic spin dimer system in strong magnetic field

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