Breakdown of the Verwey–Mott Localization Hypothesis in Magnetite.
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| Title: | Breakdown of the Verwey–Mott Localization Hypothesis in Magnetite. |
|---|---|
| Authors: | Pasternak, M. P.1 |
| Source: | Hyperfine Interactions. 2003, Vol. 151/152 Issue 1-4, p253-261. 9p. |
| Subjects: | Transition temperature, Spectrum analysis, Magnetite, Constitution of matter, Phase transitions, Physics |
| Abstract: | Temperature-dependent 57Fe Mössbauer spectroscopy to 40 GPa shows that Fe3O4 magnetite undergoes a coordination crossover (CC), whereby charge density is shifted from octahedral to tetrahedral sites and the spinel structure thus changes from inverse to normal with increasing pressure and decreasing temperature. A precursor to the CC is a d-charge decoupling within the octahedral sites at the inverse-spinel phase. The CC transition takes place almost exactly at the Verwey transition temperature (TV=122 K) at ambient pressure. While TV decreases with pressure the CC-transition temperature increases with pressure, reaching 300 K at 10 GPa. The d electron localization mechanism proposed by Verwey and later by Mott for T |
| Copyright of Hyperfine Interactions 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: | Engineering Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Breakdown of the Verwey–Mott Localization Hypothesis in Magnetite. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Pasternak%2C+M%2E+P%2E%22">Pasternak, M. P.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Hyperfine+Interactions%22">Hyperfine Interactions</searchLink>. 2003, Vol. 151/152 Issue 1-4, p253-261. 9p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Transition+temperature%22">Transition temperature</searchLink><br /><searchLink fieldCode="DE" term="%22Spectrum+analysis%22">Spectrum analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetite%22">Magnetite</searchLink><br /><searchLink fieldCode="DE" term="%22Constitution+of+matter%22">Constitution of matter</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+transitions%22">Phase transitions</searchLink><br /><searchLink fieldCode="DE" term="%22Physics%22">Physics</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Temperature-dependent 57Fe Mössbauer spectroscopy to 40 GPa shows that Fe3O4 magnetite undergoes a coordination crossover (CC), whereby charge density is shifted from octahedral to tetrahedral sites and the spinel structure thus changes from inverse to normal with increasing pressure and decreasing temperature. A precursor to the CC is a d-charge decoupling within the octahedral sites at the inverse-spinel phase. The CC transition takes place almost exactly at the Verwey transition temperature (TV=122 K) at ambient pressure. While TV decreases with pressure the CC-transition temperature increases with pressure, reaching 300 K at 10 GPa. The d electron localization mechanism proposed by Verwey and later by Mott for T<TV is shown to be unrelated to the actual mechanism of the metal–insulator transition attributed to the Verwey transition. It is proposed that a first-order phase transition taking place at ∼TV opens a small gap within the oxygen p-band, resulting in the observed insulating state at T>TV. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Hyperfine Interactions 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: 10.1023/B:HYPE.0000020416.28201.be Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 253 Subjects: – SubjectFull: Transition temperature Type: general – SubjectFull: Spectrum analysis Type: general – SubjectFull: Magnetite Type: general – SubjectFull: Constitution of matter Type: general – SubjectFull: Phase transitions Type: general – SubjectFull: Physics Type: general Titles: – TitleFull: Breakdown of the Verwey–Mott Localization Hypothesis in Magnetite. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Pasternak, M. P. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 12 Text: 2003 Type: published Y: 2003 Identifiers: – Type: issn-print Value: 03043843 Numbering: – Type: volume Value: 151/152 – Type: issue Value: 1-4 Titles: – TitleFull: Hyperfine Interactions Type: main |
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