Triplet spin resonance of the Haldane compound with interchain coupling

Details Triplet spin resonance of the Haldane compound with interchain coupling Triplet spin resonance of the Haldane compound with interchain coupling

2007-08-14

arxiv.org/abs/0708.1904v1

Phys. Rev. B 77, 100401 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 9 figures

Scientific paper

10.1103/PhysRevB.77.100401

Spin resonance absorption of the triplet excitations is studied experimentally in the Haldane magnet PbNi2V2O8. The spectrum has features of spin S=1 resonance in a crystal field, with all three components, corresponding to transitions between spin sublevels, being observable. The resonance field is temperature dependent, indicating the renormalization of excitation spectrum in interaction between the triplets. Magnetic resonance frequencies and critical fields of the magnetization curve are consistent with a boson version of the macroscopic field theory [Affleck 1992, Farutin & Marchenko 2007], implying the field induced ordering at the critical field, while contradict the previously used approach of noninteracting spin chains.

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