[en] The past years have witnessed major advancements in all-electrical doping control on cuprates. In the vast majority of cases, the tuning of charge carrier density has been achieved via electric field effect by means of either a ferroelectric polarization or using a dielectric or electrolyte gating. Unfortunately, these approaches are constrained to rather thin superconducting layers and require large electric fields in order to ensure sizable carrier modulations. In this work, we focus on the investigation of oxygen doping in an extended region through current-stimulated oxygen migration in YBa 2 Cu 3 O 7−δ superconducting bridges. The underlying methodology is rather simple and avoids sophisticated nanofabrication process steps and complex electronics. A patterned multiterminal transport bridge configuration allows us to electrically assess the directional counterflow of oxygen atoms and vacancies. Importantly, the emerging propagating front of current-dependent doping δ is probed in situ by optical microscopy and scanning electron microscopy. The resulting imaging techniques, together with photoinduced conductivity and Raman scattering investigations, reveal an inhomogeneous oxygen vacancy distribution with a controllable propagation speed permitting us to estimate the oxygen diffusivity. These findings provide direct evidence that the microscopic mechanism at play in electrical doping of cuprates involves diffusion of oxygen atoms with the applied current. The resulting fine control of the oxygen content would permit a systematic study of complex phase diagrams and the design of electrically addressable devices.
Disciplines :
Physics
Author, co-author :
Marinkovic, Stefan ; Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés > Form. doct. sc. (phys. - Paysage)
Fernandez-Rodriguez, Alejandro; Universitat Autònoma de Barcelona > Institut de Ciència de Materials de Barcelona
Collienne, Simon ; Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés
Blanco Alvarez, Sylvain ; Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés
Melinte, Sorin; Université Catholique de Louvain - UCL > Institute of Information and Communication Technologies, Electronics and Applied Mathematics
Maiorov, Boris; Los Alamos National Laboratory > Materials Physics and Applications Division
Ruis, Gemma; Universitat Autònoma de Barcelona > Institute of Microelectronics of Barcelona
Granados, Xavier; Universitat Autònoma de Barcelona > Institut de Ciència de Materials de Barcelona
Mestres, Narcis; Universitat Autònoma de Barcelona > Institut de Ciència de Materials de Barcelona
Palau, Anna; Universitat Autònoma de Barcelona > Institut de Ciència de Materials de Barcelona
Silhanek, Alejandro ; Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés
Language :
English
Title :
Direct Visualization of Current-Stimulated Oxygen Migration in YBa2Cu3O7−δ Thin Films
Publication date :
03 August 2020
Journal title :
ACS Nano
ISSN :
1936-0851
eISSN :
1936-086X
Publisher :
American Chemical Society, United States - District of Columbia
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