Ferrimagnetism in the Hubbard, dimmer-connector frustrated chain
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
Ferrimagnetism in the Hubbard, dimmer-connector frustrated chain
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| Creator |
Rössler, J.
Mainemer, D. |
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| Description |
We study the AB2 "dimmer-connector" chain within a generalized Hubbard model, which contains site-dependent parameters, and different chemical potentials for A and B sites. Considering one electron per atom, we carry out exact calculations for finite clusters, and derive some asymptotic results, valid for macroscopic chains. We take a non-vanishing intra-dimmer electron hopping, thus departing from the condition of a bipartite lattice. In spite of that, the system persists ferrimagnetic in some region of the parameter space, thus generalizing a theorem of Lieb for bipartite lattices. A somewhat surprising result is that the ferrimagnetic phase is possible, even for a very large chemical potential jump between A and B sites. In another respect, we show that a previously reported macroscopic (2N) degenerancy of the AB2 Heisenberg chain ground state (GS) is fully removed on going to the (more fundamental) Hubbard model, yielding a non-magnetic GS.
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| Date |
2012-04-06T18:01:58Z
2012-04-06T18:01:58Z 2010 |
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| Type |
Article
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| Identifier |
Ferrimagnetism in the Hubbard, dimmer-connector frustrated chain / J. Rössler, D. Mainemer // Condensed Matter Physics. — 2010. — Т. 13, № 1. — С. 13704: 1-8. — Бібліогр.: 15 назв. — англ.
1607-324X PACS: 73.90.+f, 75.10.Lp, 75.10--75.25 http://dspace.nbuv.gov.ua/handle/123456789/32048 |
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| Language |
en
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| Relation |
Condensed Matter Physics
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| Publisher |
Інститут фізики конденсованих систем НАН України
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