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

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

doi:10.1016/j.jmmm.2006.10.435

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 journal › Article › peer-review

2 Citations (Scopus)

Abstract

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 (H_c) 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 H_c.

Original language	English
Pages (from-to)	1272-1274
Number of pages	3
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2 SUPPL. PART 2
DOIs	https://doi.org/10.1016/j.jmmm.2006.10.435
Publication status	Published - 2007 Mar 1
Externally published	Yes

Keywords

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

abstract = "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.",

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T1 - Novel spin excitation in the high field phase of an S = 1 antiferromagnetic chain

AU - Hagiwara, M.

AU - Kashiwagi, T.

AU - Kimura, S.

AU - Honda, Z.

AU - Kindo, K.

PY - 2007/3/1

Y1 - 2007/3/1

N2 - 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.

AB - 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.

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KW - High field ESR

KW - S = 1 antiferromagnetic chain

KW - Spin excitation

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