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The Quasi-1D S=1/2 Antiferromagnet Cs2CuCl4 in a Magnetic Field | | R. Coldea
; D.A. Tennant
; R.A. Cowley
; D.F. McMorrow
; B. Dorner
; Z. Tylczynski
; | | Date: |
22 May 1997 | | Journal: | Phys. Rev. Lett. 79, 151 (1997) | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Affiliation: | 1,2), R.A. Cowley , D.F. McMorrow , B. Dorner and Z. Tylczynski (Clarendon Laboratory, Oxford, UK Oak Ridge National Laboratory, Oak Ridge, TN, USA Riso National Laboratory, Denmark Institut Laue-Langevin, Grenoble, France Institute of Physics, Po | | Abstract: | Magnetic excitations of the quasi-1D S=1/2 Heisenberg antiferromagnet (HAF) Cs2CuCl4 have been measured as a function of magnetic field using neutron scattering. For T<0.62 K and B=0 T the weak inter-chain coupling produces 3D incommensurate ordering. Fields greater than Bc =1.66 T, but less than the field (~8 T) required to fully align the spins, are observed to decouple the chains, and the system enters a disordered intermediate-field phase (IFP). The IFP excitations are in agreement with the predictions of Muller et al. for the 1D S=1/2 HAF, and Talstra and Haldane for the related 1/r^2 chain (the Haldane-Shastry model). This behaviour is inconsistent with linear spin-wave theory. | | Source: | arXiv, cond-mat/9705226 | | Services: | Forum | Review | PDF | Favorites | |
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