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

doi:10.1143/JPSJ.76.103703

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 journal › Article › peer-review

2 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 language	English
Article number	103703
Journal	journal of the physical society of japan
Volume	76
Issue number	10
DOIs	https://doi.org/10.1143/JPSJ.76.103703
Publication status	Published - 2007 Oct
Externally published	Yes

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)

Access to Document

10.1143/JPSJ.76.103703

Cite this

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

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.",

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

author = "Takanari Kashiwagi and Masayuki Hagiwara and Shojiro Kimura and Zentaro Honda and Koichi Kindo",

year = "2007",

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T1 - Novel spin excitations in the field-induced phase of the haldane magnet Ni(C 5H 14N 2) 2N 3(PF 6)

AU - Kashiwagi, Takanari

AU - Hagiwara, Masayuki

AU - Kimura, Shojiro

AU - Honda, Zentaro

AU - Kindo, Koichi

PY - 2007/10

Y1 - 2007/10

N2 - 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.

AB - 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.

KW - Field-induced phase

KW - High magnetic field

KW - Multifrequency ESR

KW - S = 1 one-dimensional Heisenberg antiferromagnet

KW - Spin excitation

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