Dynamics of an anisotropic Haldane antiferromagnet in strong magnetic field

Abstract

We report the results of elastic and inelastic neutron scattering experiments on the Haldane gap quantum antiferromagnet Ni(C5D14N2)2N3(PF6) performed at mK temperatures in a wide range of magnetic field applied parallel to the S = 1 spin chains. Even though this geometry is closest to an ideal axially symmetric configuration, the Haldane gap closes at the critical field Hc~4T, but reopens again at higher fields. The field dependence of the two lowest magnon modes is experimentally studied and the results are compared with the predictions of several theoretical models. We conclude that of several existing theories, only the recently proposed model [Zheludev et al., cond-mat/0301424 ] is able to reproduce all the features observed experimentally for different field orientations.

arXiv comment11 pages 8 figures submitted to Phys. Rev. B

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Cited by in corpus (12)

• Dynamics of composite Haldane spin chains in IPA-CuCl3
• Quenching the Haldane gap in spin-1 Heisenberg antiferromagnets
• Dirty-boson physics with magnetic insulators
• Dynamics of anisotropic spin dimer system in strong magnetic field
• Field-induced magnetic behavior in quasi-one-dimensional Ising-like antiferromagnet BaCo2V2O8: A single-crystal neutron diffraction study
• High-field phase diagram of the Haldane-gap antiferromagnet $Ni(C_5{H}_{14}{N}_2{)}_2{N}_3(P{F}_6)$
• Haldane-gap chains in a magnetic field
• A Near-Ideal Molecule-Based Haldane Spin-Chain
• Half-ordered state in the anisotropic Haldane-gap antiferromagnet NDMAP
• Spin dynamics of the anisotropic spin-1 antiferromagnetic chain at finite magnetic fields
• Spin-Reorientation Transition of Field-Induced Magnetic Ordering Phases in the Anisotropic Haldane System
• Bosonic representation of spin operators in the field-induced critical phase of spin-1 Haldane chains