Zeeman levels with exotic field dependence in the high field phase of a S=1 Heisenberg antiferromagnetic chain

Abstract

We have performed electron spin resonance measurements over a wide frequency and magnetic field range on a single crystal of the S=1 quasi-one-dimensional Heisenberg antiferromagnet $\mathrm{Ni}({\mathrm{C}}_5{\mathrm{H}}_{14}{\mathrm{N}}_2{)}_2{\mathrm{N}}_3(\mathrm{P}{\mathrm{F}}_6)$. We observed gapped excitation branches above the critical field ($H_{\mathrm{c}}$) where the Haldane gap closes. These branches are analyzed by a phenomenological field-theory using complex-field ${\varphi }^4$ model. A satisfactory agreement between experiment and theory is obtained.

arXiv comment4 revtex pages, 3 eps figures included

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Cited by in corpus (12)

• One-Dimensional Magnetism
• Tuning the magnetic ground state of a novel tetranuclear Nickel(II) molecular complex by high magnetic fields
• Field Induced Magnetic Ordering and Single-ion Anisotropy in the Quasi-1D Haldane Chain Compound SrNi2V2O8: A Single Crystal investigation
• High-field phase diagram of the Haldane-gap antiferromagnet $Ni(C_5{H}_{14}{N}_2{)}_2{N}_3(P{F}_6)$
• Field-induced magnetic ordering in the Haldane system PbNi2V2O8
• Dynamics of an anisotropic Haldane antiferromagnet in strong magnetic field
• Haldane-gap chains in a magnetic field
• A Near-Ideal Molecule-Based Haldane Spin-Chain
• Edge singularities in high-energy spectra of gapped one-dimensional magnets in strong magnetic fields
• Half-ordered state in the anisotropic Haldane-gap antiferromagnet NDMAP
• 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