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Magnetic properties of a spin-1/2 quadrumer chain

Andreas Honecker·Wolfram Brenig
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Abstract

We study a novel S=1/2 cluster chain Hamiltonian which has recently been proposed in the context of the charge ordered low-temperature phase of alpha'-NaV2O5. We perform a detailed investigation of this model within a large range of parameters using perturbation theory and Lanczos diagonalization. Using model-specific local conservation laws and parameter-dependent mappings to various effective low-energy Hamiltonians we uncover a rich phase diagram and several regimes of gapful spin-excitations. We find that the overall features of recent neutron scattering data on alpha'-NaV2O5 can be fitted within this model, however using a set of parameters which seems unlikely.

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Andreas Honecker, Wolfram Brenig. 2001-01-09. Magnetic properties of a spin-1/2 quadrumer chain. https://doi.org/10.1103/physrevb.63.144416

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