Gap excitations in a four-leg Heisenberg spin tube antiferromagnet

Details Gap excitations in a four-leg Heisenberg spin tube antiferromagnet Gap excitations in a four-leg Heisenberg spin tube antiferromagnet

2007-10-03

arxiv.org/abs/0710.0891v3

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

Inelastic neutron scattering is used to investigate magnetic excitations in the quasi-one-dimensional quantum spin-liquid system Cu2Cl4 D8C4SO2. 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.

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