Crystallographic directions; Electro-thermal stress; High current densities; Intermediate phasis; Local temperature; MgO substrate; Oxygen ordering; Principal axis; Vacancy migration; YBa2Cu3O7-δ; Electronic, Optical and Magnetic Materials; Condensed Matter Physics
Abstract :
[en] We experimentally investigate the displacement of oxygen vacancies at high current densities in highly untwinned YBa2Cu3O7-δ films grown on top of MgO substrates. Transport bridges oriented along the YBa2Cu3O7-δ crystallographic directions [100] (a axis), [010] (b axis), and [110] (45∘ from principal axes) reveal that the onset of vacancy migration is mainly determined by the local temperature (or equivalently by the dissipated power) rather than the associated activation energy. Exceeding this threshold value, a clear directional migration proceeds as evidenced by optical microscopy. Concomitant electrotransport measurements show that an intermediate phase, characterized by a decrease in resistivity, precedes long-range migration of vacancies. We numerically demonstrate that this intermediate phase consists of a homogenization of the oxygen distribution along the transport bridge, a phenomenon strongly dependent on the activation energy and the initial degree of disorder. These findings provide some important clues to determine the level of order/disorder in YBa2Cu3O7-δ films based on electric transport measurements.
Research Center/Unit :
CESAM - Complex and Entangled Systems from Atoms to Materials - ULiège
Disciplines :
Physics
Author, co-author :
Marinkovic, Stefan ; Université de Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM)
Trabaldo, Edoardo; Department of Microtechnology and Nanoscience, Quantum Device Physics Laboratory, Chalmers University of Technology, Göteborg, Sweden
Collienne, Simon ; Université de Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM)
Lombardi, Floriana; Department of Microtechnology and Nanoscience, Quantum Device Physics Laboratory, Chalmers University of Technology, Göteborg, Sweden
Bauch, Thilo; Department of Microtechnology and Nanoscience, Quantum Device Physics Laboratory, Chalmers University of Technology, Göteborg, Sweden
Silhanek, Alejandro ; Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés
Language :
English
Title :
Oxygen ordering in untwinned YBa2Cu3 O7-δ films driven by electrothermal stress
F.R.S.-FNRS - Fonds de la Recherche Scientifique Sverige Vetenskapsrådet
Funding text :
This work was supported by the Fonds de la Recherche Scientifique-FNRS under Grant No. U.N027.18, the COST action SUPERQUMAP (Grant No. CA 21144), the Swedish Research Council under the Grants No. 2020-05184 VR and No. 2018-04658 VR. The work of A.V.S. was partially supported by Grants No. CDR J.0151.19 and No. PDR T.0204.21 of the F.R.S.-FNRS. S.M. acknowledges support from F.R.S.-FNRS Grant No. FC 38531 (Research Fellowship ASP).
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