Low-energy excitations in the magnetized state of the bond-alternating quantum S=1 chain system NTENP

Details Low-energy excitations in the magnetized state of the bond-alternating quantum S=1 chain system NTENP Low-energy excitations in the magnetized state of the bond-alternating quantum S=1 chain system NTENP

2006-02-15

arxiv.org/abs/cond-mat/0602357v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 fugures

Scientific paper

10.1103/PhysRevB.73.174431

High intensity inelastic neutron scattering experiments on the S=1 quasi-one-dimensional bond-alternating antiferromagnet Ni(C9D24N4)(NO2)ClO4 (NTENP) are performed in magnetic fields of up to 14.8~T. Excitation in the high field magnetized quantum spin solid (ordered) phase are investigated. In addition to the previously observed coherent long-lived gap excitation [M. Hagiwara et al., Phys. Rev. Lett 94, 177202 (2005)], a broad continuum is detected at lower energies. This observation is consistent with recent numerical studies, and helps explain the suppression of the lowest-energy gap mode in the magnetized state of NTENP. Yet another new feature of the excitation spectrum is found at slightly higher energies, and appears to be some kind of multi-magnon state.

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