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Single-crystal YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ and Bi/sub 2/Ca/sub 1+//sub x/Sr/sub 2-//sub x/Cu/sub 2/O/sub 8+//sub y/ surfaces and Ag adatom-induced modification

Journal Article · · J. Appl. Phys.; (United States)
DOI:https://doi.org/10.1063/1.342709· OSTI ID:6360691
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Comparison of x-ray photoemission results for single crystal and polycrystalline YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ allows us to identify oxygen vacancies in the Cu-O chains and determine their effects on the Cu, Ba, and Y core level line shapes. The deposition of adatoms of Ag onto single crystals of YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ and Bi/sub 2/Ca/sub 1+//sub x/Sr/sub 2-//sub x/Cu/sub 2/O/sub 8+//sub y/ leads to changes in the Cu 2p/sub 3//sub ///sub 2/ emission indicative of slight Cu/sup 2 +/ to Cu/sup 1 +/ surface reduction, with greater modification for the 1-2-3's than the 2-1-2-2's. O 1s core level results show Ag-induced broadening because of these surface effects. The Ba 3d and Y 3d structures showed minimal changes for the 1-2-3 surface. Ag deposition onto the 2-1-2-2 samples also leads to Bi dissociation and subsequent surface segregation.

Research Organization:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
OSTI ID:
6360691
Journal Information:
J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 65:8; ISSN JAPIA
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COATINGS
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
DATA
DEPOSITION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTS
EMISSION
EXPERIMENTAL DATA
INFORMATION
INTERFACES
IONIZING RADIATIONS
METALS
MONOCRYSTALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PHOTOEMISSION
PHYSICAL PROPERTIES
POINT DEFECTS
POLYCRYSTALS
RADIATIONS
SECONDARY EMISSION
SILVER
SPECTROSCOPY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TYPE-II SUPERCONDUCTORS
VACANCIES
VAPOR DEPOSITED COATINGS
X RADIATION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES