Hole formation in orthorhombic and tetragonal YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/

Journal Article · Tue Dec 01 00:00:00 EST 1987 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.36.8860· OSTI ID:5619423

Ronay, M

While in the La/sub 2-//sub y/Sr/sub y/CuO/sub 4/ compound holes form because of doping with strontium, it is shown that in the YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ compound holes form because upon cooling down from high temperature, or increasing the partial pressure of oxygen at constant temperature, oxygen vacancies become occupied with oxygen ions. This process manifests itself as a positive dependence of conductivity on the partial pressure of oxygen. Analysis of the resistivity data of Freitas and Plaskett reveals that upon oxygen absorption at 500/sup 0/C by the superconducting orthorhombic phase two mobile holes form per absorbed oxygen atom, while upon oxygen absorption at 700 /sup 0/C by the nonsuperconducting tetragonal phase only one mobile hole forms per oxygen atom. Implications for the valence state of copper and oxygen in the two phases are discussed.

• Research Organization: IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598
• OSTI ID: 5619423
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 36:16
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
HOLES
COPPER OXIDES
YTTRIUM OXIDES
ORTHORHOMBIC LATTICES
TETRAGONAL LATTICES
VACANCIES
VALENCE
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
OXIDES
OXYGEN COMPOUNDS
POINT DEFECTS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties