Charge states of strongly correlated 3d oxides: from typical insulator to unconventional electron-hole Bose liquid
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
Charge states of strongly correlated 3d oxides: from typical insulator to unconventional electron-hole Bose liquid
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| Creator |
Moskvin, A.S.
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| Subject |
Новые электронные материалы и системы
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| Description |
We present a model approach to describe charge fluctuations and different charge phases in strongly correlated 3d oxides. As a generic model system one considers that of centers each with three possible valence states M⁰, described in frames of S 1 pseudospin (isospin) formalism by an effective anisotropic non-Heisenberg Hamiltonian which includes both two types of single particle correlated hopping and the two-particle hopping. Simple uniform mean-field phases include an insulating monovalent M⁰ phase, mixed-valence binary (disproportionated) M phase, and mixed-valence ternary («under-disproportionated») M⁰, phase. We consider two first phases in more details focusing on the problem of electron-hole states and different types of excitons in M⁰ phase and formation of electron-hole Bose liquid in M phase. Pseudospin formalism provides a useful framework for revealing and describing different topological charge fluctuations, in particular, like domain walls or bubble domains in antiferromagnets. Electron-lattice polarization effects are shown to be crucial for the stabilization of either phase. All the insulating systems such as M0 phase are subdivided to two classes: stable and unstable ones with regard to the formation of self-trapped charge transfer (CT) excitons. The latter systems appear to be unstable with regard to the formation of CT exciton clusters, or droplets of the electron-hole Bose liquid. The model approach suggested is believed to be applied to describe a physics of strongly correlated oxides such as cuprates, manganites, bismuthates, and other systems with charge transfer excitonic instability and/or mixed valence. We shortly discuss an unconventional scenario of the essential physics of cuprates which implies their instability with regard to the self-trapping of charge transfer excitons and the formation of electron-hole Bose liquid. |
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| Date |
2017-12-27T14:47:32Z
2017-12-27T14:47:32Z 2007 |
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| Type |
Article
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| Identifier |
Charge states of strongly correlated 3d oxides: from typical
insulator to unconventional electron-hole Bose liquid / A.S. Moskvin // Физика низких температур. — 2007. — Т. 33, № 2-3. — С. 314-327. — Бібліогр.: 34 назв. — англ.
0132-6414 PACS: 71.10.–w, 71.28.+d, 71.30.+h, 74.72.–h http://dspace.nbuv.gov.ua/handle/123456789/127739 |
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| Language |
en
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| Relation |
Физика низких температур
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| Publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
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