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...
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| Veröffentlicht in: | Физика низких температур |
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| Datum: | 2007 |
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| Sprache: | Englisch |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2007
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | 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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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862726543599468544 |
|---|---|
| author | Moskvin, A.S. |
| author_facet | Moskvin, A.S. |
| 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. |
| collection | DSpace DC |
| container_title | 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.
|
| first_indexed | 2025-12-07T18:58:39Z |
| format | Article |
| fulltext | |
| id | nasplib_isofts_kiev_ua-123456789-127739 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-12-07T18:58:39Z |
| publishDate | 2007 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Moskvin, A.S. 2017-12-27T14:47:32Z 2017-12-27T14:47:32Z 2007 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 https://nasplib.isofts.kiev.ua/handle/123456789/127739 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. Author acknowledges the stimulating discussions
 with V. Vikhnin, A.V. Mitin, S.-L. Drechsler, T.
 Mishonov, R. Hayn, I. Eremin, M. Eremin, Yu.
 Panov, V.L. Kozhevnikov and partial support by
 CRDF Grant No. REC-005, RFBR grants Nos.
 04-02-96077, 06-02-17242, and 06-03-90893. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Новые электронные материалы и системы Charge states of strongly correlated 3d oxides: from typical insulator to unconventional electron-hole Bose liquid Article published earlier |
| spellingShingle | Charge states of strongly correlated 3d oxides: from typical insulator to unconventional electron-hole Bose liquid Moskvin, A.S. Новые электронные материалы и системы |
| title | 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_short | 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 |
| topic | Новые электронные материалы и системы |
| topic_facet | Новые электронные материалы и системы |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/127739 |
| work_keys_str_mv | AT moskvinas chargestatesofstronglycorrelated3doxidesfromtypicalinsulatortounconventionalelectronholeboseliquid |