Haldane-gap excitations in the low-Hc 1-dimensional quantum antiferromagnet NDMAP
A. Zheludev, Y. Chen, C. L. Broholm, Z. Honda, K. Katsumata
Abstract
Inelastic neutron scattering on deuterated single-crystal samples is used to study Haldane-gap excitations in the new S=1 one-dimensional quantum antiferromagnet NDMAP, that was recently recognized as an ideal model system for high-field studies. The Haldane gap energies Δx=0.42 meV, Δy=0.52 meV and Δz=1.86 meV, for excitations polarized along the a, b, and c crystallographic axes, respectively, are directly measured. The dispersion perpendicular to the chain axis c is studied, and extremely weak inter-chain coupling constants Jy=1.8· 10-3 meV and Jx=3.5· 10-4 meV, along the a and b axes, respectively, are determined. The results are discussed in the context of future experiments in high magnetic fields.
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