Varela Del Arco, MaríaSefrioui, ZouhairArias Serna, DiegoNavacerrada, M. A.Lucía Mulas, María LuisaLópez de la Torre, M. A.León Yebra, CarlosLoos, G. D.Sánchez Quesada, FranciscoSantamaría Sánchez-Barriga, Jacobo2023-06-202023-06-201999-11-080031-900710.1103/PhysRevLett.83.3936https://hdl.handle.net/20.500.14352/59654© 1999 The American Physical Society. J. S. and his group thank I. K. Schuller for instruction in physics and other things in the last ten years. G. Loos thanks the sabbaticals SA 106/95 SAB1995–0685 to Universidad Complutense and Ministerio de Educación y Cultura. Financial support from CICYT Grant No. MAT94-0604 is also acknowledged.The structure of high quality [YBCO_(N)/PBCO_(M)]_(1000 Å) superlattices, with N ranging between 1 and 12 unit cells and M = 5 unit cells, grown by high oxygen pressure sputtering, is analyzed. Intracell atomic structure of the layers along the c axis and disorder at interfaces is investigated using an x-ray refinement technique. Negligible roughness, step disorder, and interdiffusion are found at the interfaces. Epitaxial mismatch strain results in a surprising reorganization of interatomic distances for the thinnest YBCO layers, which seems to correlated with the decrease in the critical temperature. Intracell structure is invoked as an additional source of T_(c) changes in very thin YBCO layers.engjournal articlehttp://dx.doi.org/10.1103/PhysRevLett.83.3936http://journals.aps.org/open access537X-ray-diffractionCritical-temperatureT-cCharge-transferOxide superconductorsDependencePressureOxygen.ElectricidadElectrónica (Física)2202.03 Electricidad