Excitations in a four-leg antiferromagnetic Heisenberg spin tube

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.100.037206· OSTI ID:931092

Garlea, Vasile O ^[1]; Zheludev, Andrey I ^[1]; Regnault, L. -P. ^[2]; Chung, J. -H. ^[3]; Qiu, Y. ^[3]; Boehm, Martin ^[4]; Habicht, Klaus ^[5]; Meissner, Michael ^[5]

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1. ORNL
2. CEA, Grenoble, France
3. National Institute of Standards and Technology (NIST)
4. Institut Laue-Langevin (ILL)
5. Hahn-Meitner Institut, Berlin, Germany

Inelastic neutron scattering is used to investigate magnetic excitations in the quasi-one-dimensional quantum spin-liquid system Cu$$_2$$Cl$$_{4}\cdot$$ D$$_8$$C$$_4$$SO$$_2$$. Contrary to previously conjectured models that relied on bond-alternating nearest neighbor interactions in the spin chains, the dominant interactions are actually next-nearest-neighbor in-chain antiferromagnetic couplings. The appropriate Heisenberg Hamiltonian is equivalent to that of a $S=1/2$ 4-leg spin-tube with almost perfect one dimensionality and no bond alternation. A partial geometric frustration of rung interactions induces a small incommensurability of short-range spin correlations.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 931092
• Journal Information: Physical Review Letters, Vol. 100; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHAINS
HAMILTONIANS
NEUTRONS
SCATTERING
SPIN