Microprobing of the chain site in YBa2Cu3O6+x by cobalt-57 as a function of the oxygen content. Superconductor-insulator transition

Z. Homonnay, Amar Nath, Yen Wei, Tian Jing

Research output: Contribution to journalArticle

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Abstract

An observation of the direct correlation between superconductivity and isomer shift of a Mössbauer probe is reported. The chain site in YBa2Cu3O6+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 O6.4. 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.

Original languageEnglish
Pages (from-to)223-226
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume174
Issue number1-3
DOIs
Publication statusPublished - Mar 1 1991

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Cobalt
Superconducting materials
cobalt
insulators
Oxygen
Isomers
oxygen
isomers
Charge transfer
shift
charge transfer
probes
leveling
Superconductivity
electronics
Carrier concentration
superconductivity
Metals
orbitals
Electrons

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Microprobing of the chain site in YBa2Cu3O6+x by cobalt-57 as a function of the oxygen content. Superconductor-insulator transition. / Homonnay, Z.; Nath, Amar; Wei, Yen; Jing, Tian.

In: Physica C: Superconductivity and its Applications, Vol. 174, No. 1-3, 01.03.1991, p. 223-226.

Research output: Contribution to journalArticle

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