Applied Physics Letters · 1988 · 35 citations · 6 references
Materials ScienceSurface CharacterizationOptical MaterialsEngineeringInterface Oxygen ContentOxidation ResistanceOptical PropertiesOxide ElectronicsSurface ScienceApplied PhysicsOxygen LossSurface AnalysisVacuum DeviceLow Oxygen CompositionOptical CharacterizationLow Oxygen MaterialOptoelectronics
Because YBa2Cu3Ox exists over a range of oxygen content and low oxygen material is nonsuperconducting, it is important to be able to measure and control this parameter for application purposes. We present an optical technique for determining oxygen loss at surfaces and interfaces, where processing and contacts with other materials may affect composition and where usual techniques are insensitive. Using a strong absorption feature at 4.1 eV which appears at low oxygen composition, we find that overlayers of Al and In remove oxygen from YBa2Cu3Ox, but Ag, Au, and room-temperature exposure to moderate vacuum do not.
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Effects of oxygen deficiency on the optical spectra of YBa2Cu3O7−x
M. Garriga, J. Humlı́ček, M. Cardona et al. · Solid State Communications · 1988 · 61 citations
Optical response of MBa2CuZ3O7–8-type materials
M. Garriga, U. D. Venkateswaran, K. Syassen et al. · Physica C Superconductivity · 1988 · 33 citations