Studies of the exactly dimerized bilayer Heisenberg model via strong coupling expansions |
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Authors: | Q. Gu J.L. Shen |
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Affiliation: | (1) Center for Advanced Study, Tsinghua University, Beijing 100084, PR China, CN;(2) Institute of Physics, Chinese Academy of Sciences, Beijing 100080, PR China, CN |
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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. Received 16 March 2000 and Received in final form 2 July 2000 |
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Keywords: | PACS. 75.10.Jm Quantized spin models - 75.30.Kz Magnetic phase boundaries (including magnetic transitions metamagnetism etc.) - 75.40.Cx Static properties (order parameter static susceptibility heat capacities critical exponents etc.) |
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