Field-induced commensurate long-range order in the Haldane-gap system NDMAZ

Abstract

High-field neutron diffraction studies of the new quantum-disordered S=1 linear-chain antiferromagnet Ni(C${}_5$H${}_{14}$N${}_2$)${}_2$N${}_3$(ClO${}_4$) (NDMAZ) are reported. At T=70 mK, at a critical field $H_c=13.4$ T applied along the (013) direction, a phase transition to a commensurate Néel-like ordered state is observed. The results are discussed in the context of existing theories of quantum phase transitions in Haldane-gap antiferromagnets, and in comparions with previous studies of the related system Ni(C${}_5$H${}_{14}$N${}_2$)${}_2$N${}_3$(PF${}_6$).

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• Quasi-elastic neutron scattering in the high-field phase of a Haldane antiferromagnet
• Field-induced quantum disordered phases in S=1/2 weakly-coupled dimer systems with site dilution
• Dynamics of an anisotropic Haldane antiferromagnet in strong magnetic field
• Haldane-gap chains in a magnetic field
• Magnetic Bose glass phases of coupled antiferromagnetic dimers with site dilution
• Half-ordered state in the anisotropic Haldane-gap antiferromagnet NDMAP
• Spin dynamics of the anisotropic spin-1 antiferromagnetic chain at finite magnetic fields
• Bosonic representation of spin operators in the field-induced critical phase of spin-1 Haldane chains