Charge states of strongly correlated 3d oxides: from typical insulator to unconventional electron-hole Bose liquid
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 effectiv...
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| Дата: | 2007 |
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| Автор: | |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2007
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| Назва видання: | Физика низких температур |
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| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/127739 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | 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. |
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irk-123456789-1277392017-12-28T03:03:11Z Charge states of strongly correlated 3d oxides: from typical insulator to unconventional electron-hole Bose liquid Moskvin, A.S. Новые электронные материалы и системы 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. 2007 Article 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 en Физика низких температур Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| topic |
Новые электронные материалы и системы Новые электронные материалы и системы |
| spellingShingle |
Новые электронные материалы и системы Новые электронные материалы и системы Moskvin, A.S. Charge states of strongly correlated 3d oxides: from typical insulator to unconventional electron-hole Bose liquid Физика низких температур |
| 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. |
| format |
Article |
| author |
Moskvin, A.S. |
| author_facet |
Moskvin, A.S. |
| author_sort |
Moskvin, A.S. |
| title |
Charge states of strongly correlated 3d oxides: from typical insulator to unconventional electron-hole Bose liquid |
| title_short |
Charge states of strongly correlated 3d oxides: from typical insulator to unconventional electron-hole Bose liquid |
| title_full |
Charge states of strongly correlated 3d oxides: from typical insulator to unconventional electron-hole Bose liquid |
| title_fullStr |
Charge states of strongly correlated 3d oxides: from typical insulator to unconventional electron-hole Bose liquid |
| title_full_unstemmed |
Charge states of strongly correlated 3d oxides: from typical insulator to unconventional electron-hole Bose liquid |
| title_sort |
charge states of strongly correlated 3d oxides: from typical insulator to unconventional electron-hole bose liquid |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| publishDate |
2007 |
| topic_facet |
Новые электронные материалы и системы |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/127739 |
| citation_txt |
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. |
| series |
Физика низких температур |
| work_keys_str_mv |
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| first_indexed |
2023-10-18T20:53:46Z |
| last_indexed |
2023-10-18T20:53:46Z |
| _version_ |
1796151390772396032 |