Pyrolysis study of solution-derived superconducting YBa2Cu3O7 films: disentangling the physico-chemical transformations

Bohores Villarejo, Cornelia Pop, Sussagna Ricart, Bernat Mundet, Anna Palau, Pere Roura-Grabulosa, Jordi Farjas, Teresa Puig * and  Xavier Obradors *. 
J. Mater. Chem. C, 2020,8, 10266-10282
DOI: 10.1039/D0TC01846E

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Relevance of the Formation of Intermediate Non-Equilibrium Phases in YBa2Cu3O7–x Film Growth by Transient Liquid-Assisted Growth

Silvia Rasi, Laia Soler, Júlia Jareño, Juri Banchewski , Roger Guzman, Cristian Mocuta, Martin Kreuzer, Susagna Ricart, Pere Roura-Grabulosa, J Jordi Farjas, Xavier Obradors and Teresa Puig
Journal of Physical Chemistry C 124, 15574-15584, 2020
DOI: 110.1021/acs.jpcc.0c03859

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Coated Conductor technology for the beamscreen chamber of future high energy circular colliders

Teresa Puig, Patrick Krkotic, Artur Romanov, Joan O’Callaghan, Danilo Andrea Zanin, Holger Neupert, Pedro Costa Pinto, Pierre Demolon, Ângelo Rafael Granadeiro Costa, Mauro Taborelli, Francis Perez, Montse Pont, Joffre Gutierrez and Sergio Calatroni. Superconductor Science and Technology

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Electrochemical Tuning of Metal Insulator Transition and Nonvolatile Resistive Switching in Superconducting Films

Anna Palau*,Alejandro Fernandez-RodriguezJuan Carlos Gonzalez-RosilloXavier GranadosMariona CollBernat BozzoRafael Ortega-HernandezJordi SuñéNarcís MestresXavier Obradors, and Teresa Puig. ACS Appl. Mater. Interfaces, 2018, 10 (36), pp 30522–30531.

DOI: 10.1021/acsami.8b08042

Modulation of carrier concentration in strongly correlated oxides offers the unique opportunity to induce different phases in the same material, which dramatically change their physical properties, providing novel concepts in oxide electronic devices with engineered functionalities. This work reports on the electric manipulation of the superconducting to insulator phase transition in YBa2Cu3O7−δ thin films by electrochemical oxygen doping. Both normal state resistance and the superconducting critical temperature can be reversibly manipulated in confined active volumes of the film by gate-tunable oxygen diffusion. Vertical and lateral oxygen mobility may be finely modulated, at the micro- and nano-scale, by tuning the applied bias voltage and operating temperature thus providing the basis for the design of homogeneous and flexible transistor-like devices with loss-less superconducting drain–source channels. We analyze the experimental results in light of a theoretical model, which incorporates thermally activated and electrically driven volume oxygen diffusion.

Angular flux creep contributions in YBa2Cu3O7−δ nanocomposites from electrical transport measurements

F. Vallès, A. Palau, V. Rouco, B. Mundet, X. Obradors & T. Puig. Scientific Reports, volume 8, Article number: 5924(2018). 

doi:10.1038/s41598-018-24392-1

Flux magnetic relaxation (flux creep) causes logarithmic decay on the critical currents in superconductors, especially at high temperatures, in detriment of applications for high temperature superconductors. In this work, we present a novel methodology to measure the flux creep rate in YBCO from electrical transport measurements instead of using traditional magnetic relaxation measurements. This new methodology provides a faster way to analyze creep and enables to expand the analysis to any orientation of the magnetic field. In particular, we have applied this analysis to study the creep rate in chemical solution deposited nanocomposites (YBCO with included nanoparticles), revealing that emerging stacking faults provide flux pinning and additionally reduce the flux magnetic relaxation.

Disentangling vortex pinning landscape in chemical solution deposited superconducting YBa2Cu3O7−x films and nanocomposites

A Palau, F Vallès, V Rouco, M Coll, Z Li, C Pop, B Mundet, J Gàzquez, R Guzman, J Gutierrez, X Obradors and T Puig. Superconductor Science and TechnologyVolume 31Number 3https://doi.org/10.1088/1361-6668/aaa65e

In-field angular pinning performances at different temperatures have been analysed on chemical solution deposited (CSD) YBa2Cu3O7−x (YBCO) pristine films and nanocomposites. We show that with this analysis we are able to quantify the vortex pinning strength and energies, associated with different kinds of natural and artificial pinning defects, acting as efficient pinning centres at different regions of the H–T phase diagram. A good quantification of the variety of pinning defects active at different temperatures and magnetic fields provides a unique tool to design the best vortex pinning landscape under different operating conditions. We have found that by artificially introducing a unique defect in the YBCO matrix, the stacking faults, we are able to modify three different contributions to vortex pinning (isotropic-strong, anisotropic-strong, and isotropic-weak). The isotropic-strong contribution, widely studied in CSD YBCO nanocomposites, is associated with nanostrained regions induced at the partial dislocations surrounding the stacking faults. Moreover, the stacking fault itself acts as a planar defect which provides a very effective anisotropic-strong pinning at H//ab. Finally, the large presence of Cu–O cluster vacancies found in the stacking faults have been revealed as a source of isotropic-weak pinning sites, very active at low temperatures and high fields.

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