Dynamics of Composite Haldane Spin Chains in IPA-CuCl₃

Journal Article · Sun Jan 01 00:00:00 EST 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.96.047210· OSTI ID:1003455

Masuda, Takatsugu ^[1]; Zheludev, Andrey I ^[1]; Manaka, H. ^[2]; Regnault, L. -P. ^[3]; Chung, J. -H. ^[4]; Qiu, Y. ^[4]

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1. ORNL
2. Kagoshima University, Kagoshima JAPAN
3. CEA, Grenoble, France
4. National Institute of Standards and Technology (NIST)

Magnetic excitations in the quasi-one-dimensional antiferromagnet IPA-CuCl{sub 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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1003455
• Journal Information: Physical Review Letters, Vol. 96, Issue 4; ISSN 0031--9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTIFERROMAGNETIC MATERIALS
COLD NEUTRONS
EXCITATION
INELASTIC SCATTERING
NEUTRON DIFFRACTION
SPIN