Journal article
Microprobing of the chain site in YBa 2Cu 3O 6+x by cobalt-57 as a function of the oxygen content : Superconductor-insulator transition
Physica. C, Superconductivity, v 174(1)
1991
Abstract
An observation of the direct correlation between superconductivity and isomer shift of a Mössbauer probe is reported. The chain site in YBa
2Cu
3O
6+
x
was microprobed by
57Co as a function of oxygen content. The dominant four-fold oxygen-coordinated species A serves uniquely to sense the electronic environment at the chain site. The magnitude of the Mössbauer isomer shift, which is inversely related to the s-electron density at the
57Fe nuclear probe, increases continuously with diminishing oxygen content and undergoes a sharp leveling off just below O
6.4. This corresponds to superconductor (metal) to insulator transition observed by Cava and coworkers for a variety of parameters versus oxygen content. It has been attributed to an electronic charge transfer from the chain to the sheet site. The increase in isomer shift with diminishing oxygen content is indicative of a decrease in itinerant electron population in 4s orbitals and may reflect the charge transfer from the chain site.
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Details
- Title
- Microprobing of the chain site in YBa 2Cu 3O 6+x by cobalt-57 as a function of the oxygen content : Superconductor-insulator transition
- Creators
- Zoltan Homonnay - Drexel UniversityAmar Nath - Drexel UniversityYen Wei - Drexel UniversityTian Jing - Drexel University
- Publication Details
- Physica. C, Superconductivity, v 174(1)
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- [Retired Faculty]
- Web of Science ID
- WOS:A1991FB82500028
- Scopus ID
- 2-s2.0-0026118426
- Other Identifier
- 991019173522604721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Physics, Applied
- Physics, Condensed Matter