Evidence of local structural transition during oxidation process of RBCO epitaxial films using time resolved reflexafs measurements |
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| Authors: | M. Salluzzo F. Natali C. Aruta M.G. Maglione F. Ricci E. Koller Ø. Fischer N.L. Saini |
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| Affiliation: | (1) INFM and Dipartimento di Scienze Fisiche, Università di Napoli “Federico II”, Piazzale Tecchio 80, 80125 Napoli, Italy, IT;(2) Operative Group in Grenoble - IN13, BP 156x, 38042 Grenoble Cedex, France, FR;(3) European Synchrotron Radiation Facility, BP 220, 38043 Grenoble Cedex, France, FR;(4) INFM-Università di Roma “Tor Vergata”, Dipartimento di Scienze e Tecnologie Fisiche ed Energetiche, Via di Tor Vergata s.n.c., 00133 Roma, Italy, IT;(5) Département de Physique de la Matière Condensée, Université de Genève, 1211 Genève 4, Switzerland, CH;(6) Dipartimento di Fisica, Università di Roma “La Sapienza”, P.le Aldo Moro 2, 00185 Roma, Italy, IT |
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| Abstract: | We report results of a time resolved X-ray Absorption Spectroscopy (XAS) experiment on the oxidation process of epitaxial Y1(Nd0.05Ba1.95)Cu3Ox superconducting thin films. For the first time Cu K-edge XAS technique has been used to explore local structural changes around the Cu ions during the oxidation process of a high critical temperature superconducting film. The results show that during the oxygenation of a tetragonal Y1(Nd0.05Ba1.95)Cu3Ox additional local transitions appear in the orthorhombic I phase, which are not linked to long range order transformations as shown by in situ X-ray diffraction experiment. New questions concerning the dynamic microscopic process leading to the oxygenation and eventually to superconductivity of the complex R1+xBa2-xCu3Ox (R = Y or rare earth) compounds arose from these results. Received 21 December 2001 Published online 25 June 2002 |
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| Keywords: | PACS. 74.72.Bk Y-based cuprates – 74.76.Bz High-Tc films – 68.55.Ln Defects and impurities: doping, implantation, distribution, concentration, etc. – 78.70.Dm X-ray absorption spectra |
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