1. Low‐temperature preparation of superconducting YBa2Cu3O7−δfilms on Si, MgO, and SrTiO3by thermal coevaporation
2. Science and Technology of Thin Film Superconductors;Baudenbacher,1990
3. Standard RBS was done by B. Scherzer, MPI für Plasmaphysik, Garching; Heavy Ion RBS by W. Assmann, Munich accelerator facility.
4. Raman measurements by C. Thomsen, MPI für Festkörperforschung, Stuttgart.
5. S. Orbach, N. Klein, G. Müller, H. Piel, P. Berberich and H. Kinder, this conference.