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Faculté des Sciences
Faculté des Sciences
MASTER THESIS
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Direct Visualization of Current Stimulated Oxygen Migration in YBa2Cu3O7-δThin Films

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Marinkovic, Stefan ULiège
Promotor(s) : Silhanek, Alejandro ULiège
Date of defense : 29-Jun-2020/30-Jun-2020 • Permalink : http://hdl.handle.net/2268.2/9301
Details
Title : Direct Visualization of Current Stimulated Oxygen Migration in YBa2Cu3O7-δThin Films
Translated title : [fr] Visualisation directe de la migration d'oxygène stimulée par le courant dans des couches minces YBa2Cu3O7-
Author : Marinkovic, Stefan ULiège
Date of defense  : 29-Jun-2020/30-Jun-2020
Advisor(s) : Silhanek, Alejandro ULiège
Committee's member(s) : Nguyen, Ngoc Duy ULiège
Lumay, Geoffroy ULiège
Martin, John ULiège
Language : English
Number of pages : 67
Keywords : [en] superconductivity
[en] ybco
[en] high temperature superconductors
[en] electromigration
[en] photoconductivity
[en] cuprate superconductivity
Discipline(s) : Physical, chemical, mathematical & earth Sciences > Physics
Physical, chemical, mathematical & earth Sciences > Chemistry
Research unit : EPNM, ULg
Target public : Researchers
Professionals of domain
Student
Complementary URL : http://www.mate.ulg.ac.be/
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en sciences physiques, à finalité approfondie
Faculty: Master thesis of the Faculté des Sciences

Abstract

[en] During the last years we have witnessed colossal 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 by 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 [1, 2]. In this master thesis, we focus on the investigation of oxygen doping in an extended region through current-stimulated oxygen migration in Y B a 2 Cu 3 O 7−δ superconducting bridges. The underlying methodology is rather simple and avoiding sophisticated overlay 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 isprobed in situ by polarized optical microscopy and scanning electron microscopy. The resulting imaging techniques, together with photo-induced 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 in cuprates involves diffusion of oxygen atoms with the applied current. The resulting fine control of the oxygen content in complex oxides paves the way towards a systematic study of complex phase diagrams and the design of electrically addressable devices.


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Author

  • Marinkovic, Stefan ULiège Université de Liège > Mast. sciences. phys. à fin. (FAME+)

Promotor(s)

Committee's member(s)

  • Nguyen, Ngoc Duy ULiège Université de Liège - ULiège > Département de physique > Physique des solides, interfaces et nanostructures
    ORBi View his publications on ORBi
  • Lumay, Geoffroy ULiège Université de Liège - ULiège > Département de physique > Physique expér. de la matière molle et des syst. complexes
    ORBi View his publications on ORBi
  • Martin, John ULiège Université de Liège - ULiège > Département de physique > Optique quantique
    ORBi View his publications on ORBi
  • Total number of views 76
  • Total number of downloads 455










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