Spin excitations in an anisotropic bond-alternating quantum S=1 chain in a magnetic field: Contrast to Haldane spin chains

M. Hagiwara; L. P. Regnault; A. Zheludev; A. Stunault; N. Metoki; T. Suzuki; S. Suga; K. Kakurai; Y. Koike; P. Vorderwisch; J. H. Chung

doi:10.1103/PhysRevLett.94.177202

Spin excitations in an anisotropic bond-alternating quantum S=1 chain in a magnetic field: Contrast to Haldane spin chains

M. Hagiwara, L. P. Regnault, A. Zheludev, A. Stunault, N. Metoki, T. Suzuki, S. Suga, K. Kakurai, Y. Koike, P. Vorderwisch, J. H. Chung

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

Abstract

Inelastic neutron scattering experiments on the S=1 quasi-one-dimensional bond-alternating antiferromagnet Ni(C9D24N4)(NO2)ClO4 have been performed under magnetic fields below and above a critical field Hc at which the energy gap closes. Normal field dependence of Zeeman splitting of the excited triplet modes below Hc has been observed, but the highest mode is unusually small and smears out with increasing field. This can be explained by an interaction with a low-lying two magnon continuum at q=π that is present in dimerized chains but absent in uniform ones. Above Hc, we find only one excited mode, in stark contrast with three massive excitations previously observed in the structurally similar Haldane-gap material NDMAP [A. Zheludev, Phys. Rev. BPRBMDO0163-1829 68, 134438 (2003)10.1103/PhysRevB.68.134438].

Original language	English
Article number	177202
Journal	Physical review letters
Volume	94
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevLett.94.177202
Publication status	Published - 2005 May 6
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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Spin excitations in an anisotropic bond-alternating quantum S=1 chain in a magnetic field : Contrast to Haldane spin chains. / Hagiwara, M.; Regnault, L. P.; Zheludev, A.; Stunault, A.; Metoki, N.; Suzuki, T.; Suga, S.; Kakurai, K.; Koike, Y.; Vorderwisch, P.; Chung, J. H.

In: Physical review letters, Vol. 94, No. 17, 177202, 06.05.2005.

Research output: Contribution to journal › Article › peer-review

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abstract = "Inelastic neutron scattering experiments on the S=1 quasi-one-dimensional bond-alternating antiferromagnet Ni(C9D24N4)(NO2)ClO4 have been performed under magnetic fields below and above a critical field Hc at which the energy gap closes. Normal field dependence of Zeeman splitting of the excited triplet modes below Hc has been observed, but the highest mode is unusually small and smears out with increasing field. This can be explained by an interaction with a low-lying two magnon continuum at q=π that is present in dimerized chains but absent in uniform ones. Above Hc, we find only one excited mode, in stark contrast with three massive excitations previously observed in the structurally similar Haldane-gap material NDMAP [A. Zheludev, Phys. Rev. BPRBMDO0163-1829 68, 134438 (2003)10.1103/PhysRevB.68.134438].",

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T2 - Contrast to Haldane spin chains

AU - Hagiwara, M.

AU - Regnault, L. P.

AU - Zheludev, A.

AU - Stunault, A.

AU - Metoki, N.

AU - Suzuki, T.

AU - Suga, S.

AU - Kakurai, K.

AU - Koike, Y.

AU - Vorderwisch, P.

AU - Chung, J. H.

PY - 2005/5/6

Y1 - 2005/5/6

N2 - Inelastic neutron scattering experiments on the S=1 quasi-one-dimensional bond-alternating antiferromagnet Ni(C9D24N4)(NO2)ClO4 have been performed under magnetic fields below and above a critical field Hc at which the energy gap closes. Normal field dependence of Zeeman splitting of the excited triplet modes below Hc has been observed, but the highest mode is unusually small and smears out with increasing field. This can be explained by an interaction with a low-lying two magnon continuum at q=π that is present in dimerized chains but absent in uniform ones. Above Hc, we find only one excited mode, in stark contrast with three massive excitations previously observed in the structurally similar Haldane-gap material NDMAP [A. Zheludev, Phys. Rev. BPRBMDO0163-1829 68, 134438 (2003)10.1103/PhysRevB.68.134438].

AB - Inelastic neutron scattering experiments on the S=1 quasi-one-dimensional bond-alternating antiferromagnet Ni(C9D24N4)(NO2)ClO4 have been performed under magnetic fields below and above a critical field Hc at which the energy gap closes. Normal field dependence of Zeeman splitting of the excited triplet modes below Hc has been observed, but the highest mode is unusually small and smears out with increasing field. This can be explained by an interaction with a low-lying two magnon continuum at q=π that is present in dimerized chains but absent in uniform ones. Above Hc, we find only one excited mode, in stark contrast with three massive excitations previously observed in the structurally similar Haldane-gap material NDMAP [A. Zheludev, Phys. Rev. BPRBMDO0163-1829 68, 134438 (2003)10.1103/PhysRevB.68.134438].

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