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Quasi-1D S=1/2 antiferromagnet Cs2CuCl4 in a magnetic field

Coldea, R; Tennant, DA; Cowley, RA; McMorrow, DF; Dorner, B; Tylczynski, Z; (1997) Quasi-1D S=1/2 antiferromagnet Cs2CuCl4 in a magnetic field. PHYS REV LETT , 79 (1) 151 - 154.

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Abstract

Magnetic excitations of the quasi-1D S = 1/2 Heisenberg antiferromagnet (HAF) Cs2CuCl4 have beer measured as a function of magnetic field using neutron scattering. For T < 0.62 K and B = 0 T the weak interchain coupling produces 3D incommensurate ordering. Fields greater than B-c = 1.66 T, but less than the field (similar or equal to 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 l/r(2) chain (the Haldane-Shastry model). This behavior is inconsistent with linear spin-wave theory.

Type: Article
Title: Quasi-1D S=1/2 antiferromagnet Cs2CuCl4 in a magnetic field
Keywords: NEUTRON, CHAINS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/136176
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