Novel spin excitations in the field-induced phase of the haldane magnet Ni(C 5H 14N 2) 2N 3(PF 6)

Takanari Kashiwagi, Masayuki Hagiwara, Shojiro Kimura, Zentaro Honda, Koichi Kindo

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We have performed electron spin resonance measurements on single crystals of the S = 1 one-dimensional Heisenberg antiferromagnet Ni(C 5H 14N 2) 2N 3(PF 6) in magnetic fields up to about 55 T and at frequencies up to about 2 THz. For both H ∥ chain and H ⊥ chain, we have found that one of the two or three excitation modes that are observed in magnetic fields between the critical field (H c) and about 15 T survives in the high-field region. This mode approaches a paramangetic resonance line at high-fields and fits well with the conventional antiferromagnetic resonance mode with easy-plane anisotropy. This result suggests that the spin-excitation modes above H c change from modes affected by quantum fluctuations to those expected for a conventional antiferromagnet.

Original languageEnglish
Article number103703
Journaljournal of the physical society of japan
Volume76
Issue number10
DOIs
Publication statusPublished - 2007 Oct
Externally publishedYes

Keywords

  • Field-induced phase
  • High magnetic field
  • Multifrequency ESR
  • S = 1 one-dimensional Heisenberg antiferromagnet
  • Spin excitation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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