Dynamics of composite Haldane spin chains in IPA-CuCl3

Details Dynamics of composite Haldane spin chains in IPA-CuCl3 Dynamics of composite Haldane spin chains in IPA-CuCl3

2005-11-06

arxiv.org/abs/cond-mat/0511143v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages 4 figures

Scientific paper

10.1103/PhysRevLett.96.047210

Magnetic excitations in the quasi-one-dimensional antiferromagnet IPA-CuCl3 are studied by cold neutron inelastic scattering. Strongly dispersive gap excitations are observed. Contrary to previously proposed models, the system is best described as an asymmetric quantum spin ladder. The observed spectrum is interpreted in terms of ``composite'' Haldane spin chains. The key difference from actual S=1 chains is a sharp cutoff of the single-magnon spectrum at a certain critical wave vector.

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