Massive triplet excitations in a magnetized anisotropic Haldane spin chain

Details Massive triplet excitations in a magnetized anisotropic Haldane spin chain Massive triplet excitations in a magnetized anisotropic Haldane spin chain

2003-01-22

arxiv.org/abs/cond-mat/0301424v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.68.134438

Inelastic neutron scattering experiments on the Haldane-gap quantum antiferromagnet \nd are performed at mK temperatures in magnetic fields of almost twice the critical field $H_c$ applied perpendicular to the spin cahins. Above $H_c$ a re-opening of the spin gap is clearly observed. In the high-field N\'eel-ordered state the spectrum is dominated by three distinct long-lived excitation branches. Several field-theoretical models are tested in a quantitative comparison with the experimental data.

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