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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.