Polarized-Neutron Observation of Longitudinal Haldane-Gap Excitations in Nd2BaNiO5

S. Raymond, T. Yokoo, A. Zheludev, S. E. Nagler, A. Wildes, Jun Akimitsu

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Polarized and unpolarized inelastic neutron scattering is used to study Haldane-gap excitations in the mixed-spin linear-chain antiferromagnet Nd2BaNiO5. The longitudinal mode, polarized along the direction of ordered moments, is observed for the first time. The model of isolated Haldane chains in a static staggered exchange field, that is known to work very well for static properties and transverse spin excitations in R2BaNiO5 compounds, fails to explain new results for the longitudinal spin gap.

Original languageEnglish
Pages (from-to)2382-2385
Number of pages4
JournalPhysical Review Letters
Volume82
Issue number2-11
Publication statusPublished - Mar 15 1999
Externally publishedYes

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neutrons
excitation
inelastic scattering
neutron scattering
moments

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Raymond, S., Yokoo, T., Zheludev, A., Nagler, S. E., Wildes, A., & Akimitsu, J. (1999). Polarized-Neutron Observation of Longitudinal Haldane-Gap Excitations in Nd2BaNiO5 . Physical Review Letters, 82(2-11), 2382-2385.

Polarized-Neutron Observation of Longitudinal Haldane-Gap Excitations in Nd2BaNiO5 . / Raymond, S.; Yokoo, T.; Zheludev, A.; Nagler, S. E.; Wildes, A.; Akimitsu, Jun.

In: Physical Review Letters, Vol. 82, No. 2-11, 15.03.1999, p. 2382-2385.

Research output: Contribution to journalArticle

Raymond, S, Yokoo, T, Zheludev, A, Nagler, SE, Wildes, A & Akimitsu, J 1999, 'Polarized-Neutron Observation of Longitudinal Haldane-Gap Excitations in Nd2BaNiO5 ', Physical Review Letters, vol. 82, no. 2-11, pp. 2382-2385.
Raymond S, Yokoo T, Zheludev A, Nagler SE, Wildes A, Akimitsu J. Polarized-Neutron Observation of Longitudinal Haldane-Gap Excitations in Nd2BaNiO5 . Physical Review Letters. 1999 Mar 15;82(2-11):2382-2385.
Raymond, S. ; Yokoo, T. ; Zheludev, A. ; Nagler, S. E. ; Wildes, A. ; Akimitsu, Jun. / Polarized-Neutron Observation of Longitudinal Haldane-Gap Excitations in Nd2BaNiO5 . In: Physical Review Letters. 1999 ; Vol. 82, No. 2-11. pp. 2382-2385.
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