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[Ni(HF$_2$)(3-Clpyridine)$_4$]BF$_4$ (NBCT) is a one-dimensional, $S = 1$spin chain material that shows no magnetic neutron Bragg peaks downtemperatures of 0.1 K. Previous work identified NBCT to be in the Haldane phaseand near a quantum phase transition as a function of $D/J$ to the large-$D$quantum paramagnet phase (QPM), where $D$ is the axial single-ion anisotropyand $J$ is the intrachain superexchange. Herein, inelastic neutron scatteringresults are presented on partially deuterated, $^{11}$B enriched NBCTpolycrystalline samples in zero magnetic field and down to temperatures of 0.3K. Comparison to density matrix renormalization group calculations yields $D/J= 1.51$ and a significant rhombic single-ion anisotropy $E$ ($E/D \approx0.03$, $E/J \approx 0.05$). These $D$, $J$, and $E$ values place NBCT in thelarge-$D$ QPM phase but precipitously near a quantum phase transition to along-range ordered phase.

Inelastic neutron scattering study of the anisotropic $S = 1$ spin chain [Ni(HF$_2$)(3-Clpyridine)$_4$]BF$_4$