https://doi.org/10.1140/epjb/e2002-00179-8
Evidence of local structural transition during oxidation process of RBCO epitaxial films using time resolved reflexafs measurements
1
INFM and Dipartimento di Scienze Fisiche, Università di Napoli “Federico II”, Piazzale Tecchio
80, 80125 Napoli, Italy
2
Operative Group in Grenoble - IN13, BP 156x, 38042 Grenoble Cedex, France
3
European Synchrotron Radiation Facility, BP 220, 38043 Grenoble Cedex, France
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
5
Département de Physique de la Matière Condensée, Université de Genève,
1211 Genève 4, Switzerland
6
Dipartimento di Fisica, Università di Roma “La Sapienza”, P.le Aldo Moro 2, 00185 Roma, Italy
Corresponding author: a salluzzo@na.infn.it
Received:
21
December
2001
Published online:
25
June
2002
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 RBa
Cu3Ox (R = Y or rare earth) compounds arose from
these results.
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
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002