Novel spin excitation in the high field phase of an S = 1 antiferromagnetic chain

M. Hagiwara, T. Kashiwagi, S. Kimura, Z. Honda, K. Kindo

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We report the results of high-field multi-frequency ESR experiment on the S = 1 Heisenberg antiferromagnetic chain Ni (C5 H14 N2)2 N3(PF6) for the fields up to about 55 T and the frequencies up to about 2 THz. We have found that excitation branches above the critical field (Hc) where the energy gap closes change into one branch around 15 T which becomes close to the paramagnetic line at high fields. The branch above 15 T fits well the conventional antiferromagnetic resonance mode with easy planar anisotropy. We compare the results with those in a weakly coupled antiferromagnetic dimer compound KCuCl3 and discuss the origin of the branches observed above Hc.

Original languageEnglish
Pages (from-to)1272-1274
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Issue number2 SUPPL. PART 2
Publication statusPublished - 2007 Mar
Externally publishedYes


  • Field induced phase
  • High field ESR
  • S = 1 antiferromagnetic chain
  • Spin excitation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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