Dynamics of Composite Haldane Spin Chains in $\mathrm{IPA}\mathrm{\text{\ensuremath{-}}}{\mathrm{CuCl}}_{3}$

Dynamics of Composite Haldane Spin Chains in $IPA − {CuCl}_{3}$

T. Masuda, A. Zheludev, H. Manaka, L.-P. Regnault, J.-H. Chung, and Y. Qiu

Phys. Rev. Lett. 96, 047210 – Published 2 February 2006

Abstract

Magnetic excitations in the quasi-one-dimensional antiferromagnet IPA- ${CuCl}_{3}$ are studied by cold neutron inelastic scattering. Strongly dispersive gap excitations are observed. Contrary to previously proposed models, the system is best described as an asymmetric quantum spin ladder. The observed spectrum is interpreted in terms of composite Haldane spin chains. The key difference from actual $S = 1$ chains is a sharp cutoff of the single-magnon spectrum at a certain critical wave vector.

Received 5 November 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.047210

Authors & Affiliations

T. Masuda^1,*, A. Zheludev^1,†, H. Manaka², L.-P. Regnault³, J.-H. Chung^4,‡, and Y. Qiu^4,‡

¹Condensed Matter Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, USA
²Graduate School of Science and Engineering, Kagoshima University, Korimoto, Kagoshima 890-0065, Japan
³CEA-Grenoble, DRFMC-SPSMS-MDN, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
⁴NCNR, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA

^*Electronic address: tmasuda@yokohama-cu.ac.jp Present address: International Graduate School of Arts and Sciences, Yokohama City University, 22-2, Seto, Kanazawa-ku, Yokohama city, Kanagawa, 236-0027, Japan.
^†Electronic address: zheludevai@ornl.gov Present address: Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, USA.
^‡Present address: Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, USA.

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Vol. 96, Iss. 4 — 3 February 2006

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Physical Review Letters

Dynamics of Composite Haldane Spin Chains in IPA−CuCl3

T. Masuda, A. Zheludev, H. Manaka, L.-P. Regnault, J.-H. Chung, and Y. Qiu

Phys. Rev. Lett. 96, 047210 – Published 2 February 2006

Abstract

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Dynamics of Composite Haldane Spin Chains in $IPA − {CuCl}_{3}$