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Titanium-oxygen reaction at the Ti/La/sub 1. 85/Sr/sub 0. 15/CuO/sub 4/ interface

Journal Article · · Appl. Phys. Lett.; (United States)
DOI:https://doi.org/10.1063/1.98512· OSTI ID:6089926
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High-resolution x-ray photoemission has been used to study the reaction between vapor deposited Ti and La/sub 1.85/Sr/sub 0.15/CuO/sub 4/. For low Ti coverages we observe a sharp decrease in electron emission within approx.2 eV of the Fermi level because of disruption of hybrid Cu 3d/sub x//sub <2/-y/sup =/-O 2p/sub x//sub ,//sub y/ orbitals, the loss of metallic character of the surface region, and the loss of superconductivity. Ti 2p and O 1s core level results show that oxygen is removed from the superconductor to form TiO/sub 2/ at low coverages. At higher coverage, the reaction becomes diffusion limited; a Ti-rich oxide or solution grows. The Cu 2p/sub 3//sub ///sub 2/ emission shows that oxygen withdrawal rapidly reduces the Cu/sup 2 +/ configuration. Ti metal forms after approx.10 A deposition.

Research Organization:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
OSTI ID:
6089926
Journal Information:
Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 51:21; ISSN APPLA
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
&amp; Refractories-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical &amp; Physicochemical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
COPPER OXIDES
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC RADIATION
ELECTRON EMISSION
ELEMENTS
EMISSION
ENERGY LEVELS
EXPERIMENTAL DATA
FERMI LEVEL
INFORMATION
IONIZING RADIATIONS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
METALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHOTOEMISSION
PHYSICAL PROPERTIES
RADIATIONS
RARE EARTH COMPOUNDS
SECONDARY EMISSION
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TITANIUM
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TYPE-II SUPERCONDUCTORS
X RADIATION