Ferrimagnetic ground state of a phenylene polymer with organic radicals |
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Authors: | WZ Wang KL Yao |
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Institution: | (1) Department of Physics, Wuhan University, Wuhan 430072, PR China, CN;(2) Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, PR China, CN |
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Abstract: | A ferrimagnetic polymer with m-phenylene skeleton as coupling unit is studied with the Hubbard model in the self-consistent mean-field theory. The ferrimagnetic
ground state with a total spin S = 1 per unit cell is obtained and originates from the antiferromagnetic correlations between the nearest neighbors. If the
on-site electron-electron repulsions at the radical sites and at the phenylene ring sites are different, the gap in energy
band structure may disappear and the ferrimagnetic ground state becomes unstable. The charge density and spin density can
transfer between the radical sites and the phenylene ring sites due to the competition between the hopping integral and the
on-site repulsion at different sites.
Received 15 July 2002 Published online 31 December 2002 |
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Keywords: | PACS 71 27 +a Strongly correlated electron systems heavy fermions – 71 10 Fd Lattice fermion models (Hubbard model etc ) – 75 30 Fv Spin-density waves |
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