The Quasi-1D S=1/2 Antiferromagnet Cs2CuCl4 in a Magnetic Field

Details The Quasi-1D S=1/2 Antiferromagnet Cs2CuCl4 in a Magnetic Field The Quasi-1D S=1/2 Antiferromagnet Cs2CuCl4 in a Magnetic Field

1997-05-22

arxiv.org/abs/cond-mat/9705226v1

Phys. Rev. Lett. 79, 151 (1997)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 4 encapsulated postscript figures, LaTeX, to be published in PRL, e-mail comments to r.coldea1@physics.ox.ac.uk

Scientific paper

10.1103/PhysRevLett.79.151

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.

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