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: Еременко, В.В., Самоваров, В.Н., Свищев, В.Н., Вакула, В.Л., Либин, М.Ю., Уютнов, С.А.
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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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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