Abstract:
The one-triplet excitation spectra and thermodynamic properties for the dimerized phase of the frustrated bilayer Heisenberg model are studied using strong-coupling expansion theory. The model has an exact dimerized ground state as well as exact one-triplet excitations in a special case that the frustration J2 is equal to the in-plane coupling J1. We demonstrate that the models with and without frustrations have distinct excitation spectra, so their thermodynamic properties exhibit quite different behaviors. Especially, the low-temperature behaviors of the frustrated model with J 1=J 2 are independent of the inter-dimer couplings, due to the exact one-triplet excitations.
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Received 16 March 2000 and Received in final form 2 July 2000
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Gu, Q., Shen, J. Studies of the exactly dimerized bilayer Heisenberg model via strong coupling expansions. Eur. Phys. J. B 18, 63–66 (2000). https://doi.org/10.1007/s100510070078
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DOI: https://doi.org/10.1007/s100510070078