Ciències experimentals i tecnologia: a Teresa Puig i Xavier Obradors “pel descobriment d’un procediment de producció de materials superconductors assequible i industrialitzable, basat en la cristal·lització ultraràpida, aplicable a la gestió sostenible de l’energia elèctrica”.
http://www.ara.cat/cultura/Preston-Esquirol-Atrapa-Ciutat-Barcelona_0_1516048478.html
X Palmer, C Pop, H Eloussifi, B Villarejo, P Roura, J Farjas, A Calleja, A Palau, X Obradors,T Puig, and S Ricart, Supercond. Sci. Technol. 29 (2016) 024002 (11pp)
doi:10.1088/0953-2048/29/2/024002
We present our work in the preparation of metallorganic precursor solutions with reduced fluorine content, able to fulfil the requirements for high-performance superconducting YBCO epitaxial layers as a promising approach to low cost and scalable coated conductors. Six different solutions using different quantities of fluorine and non-fluorine carboxylate precursors with a total amount of fluorine from 10 to 50% that of standard trifluoroacetic acid (TFA) solutions. For stabilization purposes different coordinating agents have been used and the solution rheology has been modified for proper substrate wettability. Thermal decomposition analysis and infrared spectroscopy performed directly in films, have revealed that the decomposition takes place in two consecutive stages around 265 and 310 °C respectively, and nuclear magnetic resonance (NMR) analysis could unveil the chemical reactions taking place in the solution. Using the solutions with 20% fluorine and upon optimization of the growth process parameters, YBCO layers with Tc andJc(77 K) of 90 K and 4 MA cm−2 are obtained.
Neus Romà defended his PhD Thesis, entitled “Estudio de soluciones precursoras para el crecimiento de capas superconductoras gruesas por el método de deposición de soluciones químicas”, the jury formed by Maria Lourdes Calzada, Jordi Farjas and Monica Lira awarded her work with an Excel·lent Cum Laude which is the maximum qualification for a PhD thesis at the Universitat Autònoma de Barcelona.
Congratulations Neus!
Rafael Ortega defended his PhD Thesis, entitled “Memorias Resistivas basadas en óxidos complejos”, the jury formed by Juan Antonio Rubio Solá, Juan Bautista Roldán Aranda and Luis Eduardo Hueso Arroyo awarded his work with an Excellent for a PhD thesis at the Universitat Autònoma de Barcelona.
Congratulations Rafael!
P Cayado, K De Keukeleere, A Garzón, L Perez-Mirabet, A Meledin, J De Roo, F Vallés, B Mundet, H Rijckaert, G Pollefeyt, M Coll1, S Ricart, A Palau, J Gázquez, J Ros, G Van Tendeloo, I Van Driessche, T Puig and X Obradors.
IOP Publishing Ltd • Superconductor Science and Technology, Volume 28
A methodology of general validity to prepare epitaxial nanocomposite films based on the use of colloidal solutions containing different crystalline preformed oxide nanoparticles (ex situnanocomposites) is reported. The trifluoroacetate (TFA) metal–organic chemical solution deposition route is used with alcoholic solvents to grow epitaxial YBa2Cu3O7 (YBCO) films. For this reason stabilizing oxide nanoparticles in polar solvents is a challenging goal. We have used scalable nanoparticle synthetic methodologies such as thermal and microwave-assisted solvothermal techniques to prepare CeO2 and ZrO2 nanoparticles. We show that stable and homogeneous colloidal solutions with these nanoparticles can be reached using benzyl alcohol, triethyleneglycol, nonanoic acid, trifluoroacetic acid or decanoic acid as protecting ligands, thereby allowing subsequent mixing with alcoholic TFA solutions. An elaborate YBCO film growth analysis of these nanocomposites allows the identification of the different relevant growth phenomena, e.g. nanoparticles pushing towards the film surface, nanoparticle reactivity, coarsening and nanoparticle accumulation at the substrate interface. Upon mitigation of these effects, YBCO nanocomposite films with high self-field critical currents (Jc ~ 3–4 MA cm−2 at 77 K) were reached, indicating no current limitation effects associated with epitaxy perturbation, while smoothed magnetic field dependences of the critical currents at high magnetic fields and decreased effective anisotropic pinning behavior confirm the effectiveness of the novel developed approach to enhance vortex pinning. In conclusion, a novel low cost solution-derived route to high current nanocomposite superconducting films and coated conductors has been developed with very promising features.
The 2015 MRS Fall Meeting was held in Boston, Massachusetts, from September 15 to 18 2015
Mariona Coll presented a contributed oral presentation:
“Compositional Tuning with Atomic Scale Control of Functional Perovskite Oxide Thin Films by Low Temperature Chemical Deposition Methodologies”
Symposium FF—Integration of Functional Oxides with Semiconductors
WORKSHOP on VORTEX PHYSICS OF STRAINED NANOCOMPOSITE FILMSOrganizer and Chair: Prof. Teresa Puig10-11 December 2015ICMAB-CSICAgenda Day 1
9:30 Registration
10:00 Laboratories tour
11:30 Coffee breakSession I: Vortex physics in PLD nanocompositesSession Chair: Prof. Guy Deutscher, Center for Nanoscience and Nanotechnology, Tel Aviv University.
12:00-12:45 Kaname Matsumoto, Kyushu Institute of Technology, Japan: “Critical current control in REBCO superconductor by using different kinds of artificial pinning centers”
13:00 Lunch
14:00-14:45 Yutaka Yoshida, Kyushu Institute of Technology, Japan: “Jc enhancement in the nanorod-introduced REBCO films on single-crystalline substrates and metal tapes”
14:45-15:30 Satoshi Awaji, Kyushu Institute of Technology, Japan: “Flux pining state and its effect on Jc and Bi properties under the nanorod-introduced REBCO films”
15:30 Coffee BreakSession II: Vortex physics in CSD nanocomposites Session Chair: Prof. Kaname Matsumoto, Kyushu Institute of Technology, Japan
16:00-16:45 Mariona Coll, ICMAB-CSIC: “CSD Growth of nanocomposites”
17:00-17:45 Bernat Mundet, ICMAB-CSIC: “Origin, evolution and interaction of structural defects in nanocomposites grown by CSD”
17:45-18:30 Ferran Vallès, ICMAB-CSIC: Tuning vortex pinning landscape and anisotropy of CSD Nanocomposites
18:30 Closing session
19:30 Aperitive20:30 dinnerRestaurante La Marmita – Hotel Campus
Vila Universitària Campus de la UAB
08193 Bellaterra (Cerdanyola del Vallès)
Taxis will be arranged to go back to Barcelona
*All invited talks are of 30 min plus 15 minutes discussion.
Agenda Day 2Session III: Vortex physics and electronic structureSession Chair: Dr. Anna Palau, ICMAB-CSIC
9:30-10:15 Enrico Silva, Dept. of Engineering, Università Roma Tre: What can we learn from pinning and dissipation of superconducting nanocomposite films with microwaves
10:15-11:00 Guy Deutscher, Center for Nanoscience and Nanotechnology, Tel Aviv University : Lattice strain effects on pair condensation and vortex pinning
11:00-11:30 Coffee break11:30 General Discussion:Session Chair: Prof. Teresa Puig, ICMAB-CSIC
Are the pinning centers of high temperature effective at low temperature?
What determines de irreversibility line?
What similarities can be gathered between CSD and PLD regarding vortex pinning?
Do we have isotropic strain in PLD nanocomposites at low temperature like in CSD?
What are the consequences of strain in the electronic density of state?
How can we measure the consequences of strain on the DOS or quasiparticles behavior?
Can microwave measurements answer some questions regarding the quasiparticles nature in strained regions?
13:00 Lunch15:00 Discussion and future collaboration initiatives17:00 Closing of the workshop
The 2nd International Conference Aircraft Cabling will be held from the 1-3 of December 2015 in Hamburg, Germany
Xavier Granados will present a contributed invited conference:
“Superconducting cables (Towards compact and lightweight electrical machines)”
Affirms Dr. Xavier Granados, scientist at the Institute of Materials Science of Barcelona, talking about the major challenges regardingsuperconducting cables in thisinterview.http://www.aircraft-cabling.com/
In this work, ferroelectricity is identified in nanocrystalline BiFeO3 (BFO) thin films prepared by low-temperature atomic layer deposition. A combination of X-ray diffraction, reflection high energy electron diffraction, and scanning transmission electron microscopy analysis indicates that the as-deposited films (250 °C) consist of BFO nanocrystals embedded in an amorphous matrix. Postannealing at 650 °C for 60 min converts the sample to a crystalline film on a SrTiO3substrate. Piezoelectric force microscopy demonstrates the existence of ferroelectricity in both as-deposited and postannealed films. The ferroelectric behavior in the as-deposited stage is attributed to the presence of nanocrystals. Finally, a band gap of 2.7 eV was measured by spectroscopic ellipsometry. This study opens broad possibilities toward ferroelectric oxides on 3D substrates and also for the development of new ferroelectric perovskites prepared at low temperature.
Ciències experimentals i tecnologia: a Teresa Puig i Xavier Obradors “pel descobriment d’un procediment de producció de materials superconductors assequible i industrialitzable, basat en la cristal·lització ultraràpida, aplicable a la gestió sostenible de l’energia elèctrica”.
http://www.ara.cat/cultura/Preston-Esquirol-Atrapa-Ciutat-Barcelona_0_1516048478.html
WORKSHOP on VORTEX PHYSICS OF STRAINED NANOCOMPOSITE FILMS
Organizer and Chair: Prof. Teresa Puig
10-11 December 2015
ICMAB-CSIC
Agenda Day 1
9:30 Registration
10:00 Laboratories tour
11:30 Coffee break
Session I: Vortex physics in PLD nanocomposites
Session Chair: Prof. Guy Deutscher, Center for Nanoscience and Nanotechnology, Tel Aviv University.
12:00-12:45 Kaname Matsumoto, Kyushu Institute of Technology, Japan: “Critical current control in REBCO superconductor by using different kinds of artificial pinning centers”
13:00 Lunch
14:00-14:45 Yutaka Yoshida, Kyushu Institute of Technology, Japan: “Jc enhancement in the nanorod-introduced REBCO films on single-crystalline substrates and metal tapes”
14:45-15:30 Satoshi Awaji, Kyushu Institute of Technology, Japan: “Flux pining state and its effect on Jc and Bi properties under the nanorod-introduced REBCO films”
15:30 Coffee Break
Session II: Vortex physics in CSD nanocomposites
Session Chair: Prof. Kaname Matsumoto, Kyushu Institute of Technology, Japan
16:00-16:45 Mariona Coll, ICMAB-CSIC: “CSD Growth of nanocomposites”
17:00-17:45 Bernat Mundet, ICMAB-CSIC: “Origin, evolution and interaction of structural defects in nanocomposites grown by CSD”
17:45-18:30 Ferran Vallès, ICMAB-CSIC: Tuning vortex pinning landscape and anisotropy of CSD Nanocomposites
18:30 Closing session
19:30 Aperitive
20:30 dinner
Restaurante La Marmita – Hotel Campus
Vila Universitària Campus de la UAB
08193 Bellaterra (Cerdanyola del Vallès)
Taxis will be arranged to go back to Barcelona
*All invited talks are of 30 min plus 15 minutes discussion.
Agenda Day 2
Session III: Vortex physics and electronic structure
Session Chair: Dr. Anna Palau, ICMAB-CSIC
9:30-10:15 Enrico Silva, Dept. of Engineering, Università Roma Tre: What can we learn from pinning and dissipation of superconducting nanocomposite films with microwaves
10:15-11:00 Guy Deutscher, Center for Nanoscience and Nanotechnology, Tel Aviv University : Lattice strain effects on pair condensation and vortex pinning
11:00-11:30 Coffee break
11:30 General Discussion:
Session Chair: Prof. Teresa Puig, ICMAB-CSIC
Are the pinning centers of high temperature effective at low temperature?
What determines de irreversibility line?
What similarities can be gathered between CSD and PLD regarding vortex pinning?
Do we have isotropic strain in PLD nanocomposites at low temperature like in CSD?
What are the consequences of strain in the electronic density of state?
How can we measure the consequences of strain on the DOS or quasiparticles behavior?
Can microwave measurements answer some questions regarding the quasiparticles nature in strained regions?
13:00 Lunch
15:00 Discussion and future collaboration initiatives
17:00 Closing of the workshop
