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Full-Text Articles in Physical Sciences and Mathematics
Phases Found At Grain Boundary Of Yba2cu3o7-D 50 Nm Films On Srtio3 By Enhanced Anomalous Scattering At O:K, Cu:L2,3 And Ba:M4,5 Edges, Juana Acrivos
Phases Found At Grain Boundary Of Yba2cu3o7-D 50 Nm Films On Srtio3 By Enhanced Anomalous Scattering At O:K, Cu:L2,3 And Ba:M4,5 Edges, Juana Acrivos
Faculty Publications, Chemistry
A new phase is detected within 100micrometers of 24 DEG ab grain boundary (GB) in YBa2Cu3O7-d 50 nm films on SrTiO3 by enhanced (001) anomalous scattering. Site identification and temperature dependence is interpreted using crystallographic weights to distinguish enhanced scattering from total electron yield and fluorescence spectra. The c-axis, c0 indicates that only ortho-I phase is present far from GB, both ortho-I and II phases are present near GB. The phase c0 is constant versus temperature across the transition to superconductivity.
Enhanced Anomalous Scattering By Superconducting Nanofilms Vs T At O:K, Cu:L2,3 , Ba:M4,5 Edges, Juana Acrivos
Enhanced Anomalous Scattering By Superconducting Nanofilms Vs T At O:K, Cu:L2,3 , Ba:M4,5 Edges, Juana Acrivos
Faculty Publications, Chemistry
Enhanced (001) anomalous scattering by YBa2Cu3O7-δ 50 nm films on SrTiO3 substrates with and without a grain boundary versus temperature is interpreted using crystallographic weights to distinguish it from total electron yield and fluorescence spectra. The power of diffraction enhancement is to ascertain the film oxygen composition from the changes in the c-axis, c0 as the film surface is scanned across the grain boundary, and to determine that c0 is constantversus temperature across the superconducting phase transition.