Проявление хаббардовских и ковалентных корреляций в спектрах поглощения пленок YBa₂Cu₃O₆₊x
В области энергий 0,3-3 эВ измерены спектры поглощения монокристаллических пленок YBa₂Cu₃O₆₊x разного уровня допирования от x≈0,35 до x≈0,9. Проведен анализ спектрального состава поглощения с учетом внутризонных и межзонных переходов, а также локальных dd-переходов в ионе Cu²⁺ . Сделан вывод, что dd...
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| Published in: | Физика низких температур |
|---|---|
| Date: | 2000 |
| Main Authors: | , , , , , |
| Format: | Article |
| Language: | Russian |
| Published: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2000
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| Online Access: | https://nasplib.isofts.kiev.ua/handle/123456789/129154 |
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| Journal Title: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Cite this: | Проявление хаббардовских и ковалентных корреляций в спектрах поглощения пленок YBa₂Cu₃O₆₊x / В.В. Еременко, В.Н. Самоваров, В.Н. Свищев, В.Л. Вакула, М.Ю. Либин, С.А. Уютнов // Физика низких температур. — 2000. — Т. 26, № 8. — С. 739-754. — Бібліогр.: 43 назв. — рос. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1859639283333201920 |
|---|---|
| author | Еременко, В.В. Самоваров, В.Н. Свищев, В.Н. Вакула, В.Л. Либин, М.Ю. Уютнов, С.А. |
| author_facet | Еременко, В.В. Самоваров, В.Н. Свищев, В.Н. Вакула, В.Л. Либин, М.Ю. Уютнов, С.А. |
| citation_txt | Проявление хаббардовских и ковалентных корреляций в спектрах поглощения пленок YBa₂Cu₃O₆₊x / В.В. Еременко, В.Н. Самоваров, В.Н. Свищев, В.Л. Вакула, М.Ю. Либин, С.А. Уютнов // Физика низких температур. — 2000. — Т. 26, № 8. — С. 739-754. — Бібліогр.: 43 назв. — рос. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| description | В области энергий 0,3-3 эВ измерены спектры поглощения монокристаллических пленок YBa₂Cu₃O₆₊x разного уровня допирования от x≈0,35 до x≈0,9. Проведен анализ спектрального состава поглощения с учетом внутризонных и межзонных переходов, а также локальных dd-переходов в ионе Cu²⁺ . Сделан вывод, что dd-полоса (пеpеход dxy→dx²-y² пpи 1,5 эВ) отpажает усиление ковалентных связей (pd-гибридизацию) при металлизации, а спектральная особенность при ≈1,8 эВ несет информацию о вкладе электронных корреляций, поскольку она чувствительна к открытию спиновой щели в диэлектpике и к антиферромагнитным флуктуациям в металле. Ковалентный (≈1,5 эВ) и корреляционный (≈1,8 эВ) максимумы поглощения при металлизации конкурируют между собой. Однако сосуществование этих полос в металле дает основание говорить о справедливости модели корреляционного полярона -носителя заряда, создающего вокруг себя область ковалентных связей в хаббардовской матрице антиферромагнитных флуктуаций.
The absorption spectra of single-crystal YBa₂Cu₃O₆₊x films with various doping levels in the range from x≈0.35 to x≈0.9 are measured in the energy region 0.3–3 eV. An analysis of the spectral composition of the absorption is made with allowance for intraband and interband transitions and the local dddd transitions in the Cu2+ ion. It is concluded that the dddd band (the transition dxy→dx²-y² at 1.5 eV) reflects the enhancement of the covalent bonding (pd hybridization) upon metallization and that the spectral feature at ≈1.8 eV carries information about the contribution of electronic correlations, since it is sensitive to the opening of a spin gap in the insulator and to antiferromagnetic fluctuations in the metal. Although the covalent (≈1.5 eV) and correlation (≈1.8 eV) absorption peaks compete with each other, the coexistence of these bands in the metal supports the validity of a model based on the correlation polaron — a charge carrier which creates a region of covalent bonding in a Hubbard matrix of antiferromagnetic fluctuations.
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| first_indexed | 2025-12-07T13:19:31Z |
| format | Article |
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| id | nasplib_isofts_kiev_ua-123456789-129154 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | Russian |
| last_indexed | 2025-12-07T13:19:31Z |
| publishDate | 2000 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Еременко, В.В. Самоваров, В.Н. Свищев, В.Н. Вакула, В.Л. Либин, М.Ю. Уютнов, С.А. 2018-01-16T16:48:59Z 2018-01-16T16:48:59Z 2000 Проявление хаббардовских и ковалентных корреляций в спектрах поглощения пленок YBa₂Cu₃O₆₊x / В.В. Еременко, В.Н. Самоваров, В.Н. Свищев, В.Л. Вакула, М.Ю. Либин, С.А. Уютнов // Физика низких температур. — 2000. — Т. 26, № 8. — С. 739-754. — Бібліогр.: 43 назв. — рос. 0132-6414 PACS: 74.72.Bk, 74.72.Dn https://nasplib.isofts.kiev.ua/handle/123456789/129154 В области энергий 0,3-3 эВ измерены спектры поглощения монокристаллических пленок YBa₂Cu₃O₆₊x разного уровня допирования от x≈0,35 до x≈0,9. Проведен анализ спектрального состава поглощения с учетом внутризонных и межзонных переходов, а также локальных dd-переходов в ионе Cu²⁺ . Сделан вывод, что dd-полоса (пеpеход dxy→dx²-y² пpи 1,5 эВ) отpажает усиление ковалентных связей (pd-гибридизацию) при металлизации, а спектральная особенность при ≈1,8 эВ несет информацию о вкладе электронных корреляций, поскольку она чувствительна к открытию спиновой щели в диэлектpике и к антиферромагнитным флуктуациям в металле. Ковалентный (≈1,5 эВ) и корреляционный (≈1,8 эВ) максимумы поглощения при металлизации конкурируют между собой. Однако сосуществование этих полос в металле дает основание говорить о справедливости модели корреляционного полярона -носителя заряда, создающего вокруг себя область ковалентных связей в хаббардовской матрице антиферромагнитных флуктуаций. The absorption spectra of single-crystal YBa₂Cu₃O₆₊x films with various doping levels in the range from x≈0.35 to x≈0.9 are measured in the energy region 0.3–3 eV. An analysis of the spectral composition of the absorption is made with allowance for intraband and interband transitions and the local dddd transitions in the Cu2+ ion. It is concluded that the dddd band (the transition dxy→dx²-y² at 1.5 eV) reflects the enhancement of the covalent bonding (pd hybridization) upon metallization and that the spectral feature at ≈1.8 eV carries information about the contribution of electronic correlations, since it is sensitive to the opening of a spin gap in the insulator and to antiferromagnetic fluctuations in the metal. Although the covalent (≈1.5 eV) and correlation (≈1.8 eV) absorption peaks compete with each other, the coexistence of these bands in the metal supports the validity of a model based on the correlation polaron — a charge carrier which creates a region of covalent bonding in a Hubbard matrix of antiferromagnetic fluctuations. ru Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Свеpхпpоводимость, в том числе высокотемпеpатуpная Проявление хаббардовских и ковалентных корреляций в спектрах поглощения пленок YBa₂Cu₃O₆₊x Manifestation of Hubbard and covalent correlations in the absorption spectra of YBa₂Cu₃O₆₊x films Article published earlier |
| spellingShingle | Проявление хаббардовских и ковалентных корреляций в спектрах поглощения пленок YBa₂Cu₃O₆₊x Еременко, В.В. Самоваров, В.Н. Свищев, В.Н. Вакула, В.Л. Либин, М.Ю. Уютнов, С.А. Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| title | Проявление хаббардовских и ковалентных корреляций в спектрах поглощения пленок YBa₂Cu₃O₆₊x |
| title_alt | Manifestation of Hubbard and covalent correlations in the absorption spectra of YBa₂Cu₃O₆₊x films |
| title_full | Проявление хаббардовских и ковалентных корреляций в спектрах поглощения пленок YBa₂Cu₃O₆₊x |
| title_fullStr | Проявление хаббардовских и ковалентных корреляций в спектрах поглощения пленок YBa₂Cu₃O₆₊x |
| title_full_unstemmed | Проявление хаббардовских и ковалентных корреляций в спектрах поглощения пленок YBa₂Cu₃O₆₊x |
| title_short | Проявление хаббардовских и ковалентных корреляций в спектрах поглощения пленок YBa₂Cu₃O₆₊x |
| title_sort | проявление хаббардовских и ковалентных корреляций в спектрах поглощения пленок yba₂cu₃o₆₊x |
| topic | Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| topic_facet | Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/129154 |
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