Temperature-induced A–B intersite charge transfer in an A-site-ordered LaCu3Fe4O12 perovskite.
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| Title: | Temperature-induced A–B intersite charge transfer in an A-site-ordered LaCu |
|---|---|
| Authors: | Long, Y. W., Hayashi, N., Saito, T., Azuma, M., Muranaka, S., Shimakawa, Y. |
| Source: | Nature. 3/5/2009, Vol. 458 Issue 7234, p60-63. 4p. 1 Diagram, 3 Graphs. |
| Subjects: | Letters to the editor, Charge transfer |
| Abstract: | Changes of valence states in transition-metal oxides often cause significant changes in their structural and physical properties. Chemical doping is the conventional way of modulating these valence states. In ABO3 perovskite and/or perovskite-like oxides, chemical doping at the A site can introduce holes or electrons at the B site, giving rise to exotic physical properties like high-transition-temperature superconductivity and colossal magnetoresistance. When valence-variable transition metals at two different atomic sites are involved simultaneously, we expect to be able to induce charge transfer—and, hence, valence changes—by using a small external stimulus rather than by introducing a doping element. Materials showing this type of charge transfer are very rare, however, and such externally induced valence changes have been observed only under extreme conditions like high pressure. Here we report unusual temperature-induced valence changes at the A and B sites in the A-site-ordered double perovskite LaCu3Fe4O12; the underlying intersite charge transfer is accompanied by considerable changes in the material’s structural, magnetic and transport properties. When cooled, the compound shows a first-order, reversible transition at 393 K from LaCu2+3Fe3.75+4O12 with Fe3.75+ ions at the B site to LaCu3+3Fe3+4O12 with rare Cu3+ ions at the A site. Intersite charge transfer between the A-site Cu and B-site Fe ions leads to paramagnetism-to-antiferromagnetism and metal-to-insulator isostructural phase transitions. What is more interesting in relation to technological applications is that this above-room-temperature transition is associated with a large negative thermal expansion. [ABSTRACT FROM AUTHOR] |
| Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Psychology and Behavioral Sciences Collection |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: pbh DbLabel: Psychology and Behavioral Sciences Collection An: 36803536 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Temperature-induced A–B intersite charge transfer in an A-site-ordered LaCu<subscript>3</subscript>Fe<subscript>4</subscript>O<subscript>12</subscript> perovskite. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Long%2C+Y%2E+W%2E%22">Long, Y. W.</searchLink><br /><searchLink fieldCode="AR" term="%22Hayashi%2C+N%2E%22">Hayashi, N.</searchLink><br /><searchLink fieldCode="AR" term="%22Saito%2C+T%2E%22">Saito, T.</searchLink><br /><searchLink fieldCode="AR" term="%22Azuma%2C+M%2E%22">Azuma, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Muranaka%2C+S%2E%22">Muranaka, S.</searchLink><br /><searchLink fieldCode="AR" term="%22Shimakawa%2C+Y%2E%22">Shimakawa, Y.</searchLink> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Nature%22">Nature</searchLink>. 3/5/2009, Vol. 458 Issue 7234, p60-63. 4p. 1 Diagram, 3 Graphs. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Letters+to+the+editor%22">Letters to the editor</searchLink><br /><searchLink fieldCode="DE" term="%22Charge+transfer%22">Charge transfer</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Changes of valence states in transition-metal oxides often cause significant changes in their structural and physical properties. Chemical doping is the conventional way of modulating these valence states. In ABO3 perovskite and/or perovskite-like oxides, chemical doping at the A site can introduce holes or electrons at the B site, giving rise to exotic physical properties like high-transition-temperature superconductivity and colossal magnetoresistance. When valence-variable transition metals at two different atomic sites are involved simultaneously, we expect to be able to induce charge transfer—and, hence, valence changes—by using a small external stimulus rather than by introducing a doping element. Materials showing this type of charge transfer are very rare, however, and such externally induced valence changes have been observed only under extreme conditions like high pressure. Here we report unusual temperature-induced valence changes at the A and B sites in the A-site-ordered double perovskite LaCu3Fe4O12; the underlying intersite charge transfer is accompanied by considerable changes in the material’s structural, magnetic and transport properties. When cooled, the compound shows a first-order, reversible transition at 393 K from LaCu2+3Fe3.75+4O12 with Fe3.75+ ions at the B site to LaCu3+3Fe3+4O12 with rare Cu3+ ions at the A site. Intersite charge transfer between the A-site Cu and B-site Fe ions leads to paramagnetism-to-antiferromagnetism and metal-to-insulator isostructural phase transitions. What is more interesting in relation to technological applications is that this above-room-temperature transition is associated with a large negative thermal expansion. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1038/nature07816 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 4 StartPage: 60 Subjects: – SubjectFull: Letters to the editor Type: general – SubjectFull: Charge transfer Type: general Titles: – TitleFull: Temperature-induced A–B intersite charge transfer in an A-site-ordered LaCu3Fe4O12 perovskite. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Long, Y. W. – PersonEntity: Name: NameFull: Hayashi, N. – PersonEntity: Name: NameFull: Saito, T. – PersonEntity: Name: NameFull: Azuma, M. – PersonEntity: Name: NameFull: Muranaka, S. – PersonEntity: Name: NameFull: Shimakawa, Y. IsPartOfRelationships: – BibEntity: Dates: – D: 05 M: 03 Text: 3/5/2009 Type: published Y: 2009 Identifiers: – Type: issn-print Value: 00280836 Numbering: – Type: volume Value: 458 – Type: issue Value: 7234 Titles: – TitleFull: Nature Type: main |
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