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Magnetic excitation in an anisotropic bond-alternating S = 1 one dimensional antiferromagnet Ni(C9D24N4)(NO2)ClO4

We report the results of inelastic neutron scattering (INS) experiments on the S = 1 bond-alternating quasi-one-dimensional (1D) antiferromagnet Ni(C 9 D 24 N 4 )(NO 2 )ClO 4 under magnetic' fields below and above the critical field H c at which the energy gap closes. Normal field dependence of Zeeman split of the excited triplet state below H c has been observed, but the highest mode is unusually small and smears out with increasing field. This is probably explained by the highest branch buried in a magnon continuum, which was never observed in the S = 1 antiferromagnetic uniform chain. Above H c , we observed only one excitation branch, which is completely different from the Haldane material NDMAP [A. Zheludev et al., Phys. Rev. B 68 (2003), 134438] where three gapped branches were clearly observed.