Titanium-oxygen reaction at the Ti/La1.85Sr0.15CuO4 interface

Meyer, H. M.; Hill, D. M.; Anderson, Steven G.; Weaver, J. H.; Capone, D. W.
November 1987
Applied Physics Letters;11/23/1987, Vol. 51 Issue 21, p1750
Academic Journal
High-resolution x-ray photoemission has been used to study the reaction between vapor deposited Ti and La1.85Sr0.15CuO4. For low Ti coverages we observe a sharp decrease in electron emission within ∼2 eV of the Fermi level because of disruption of hybrid Cu 3dx2-y2-O 2px,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 TiO2 at low coverages. At higher coverage, the reaction becomes diffusion limited; a Ti-rich oxide or solution grows. The Cu 2p3/2 emission shows that oxygen withdrawal rapidly reduces the Cu2+ configuration. Ti metal forms after ∼10 Å deposition.


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