Month: December 2015

18 December 2015: Rafael Ortega’s PhD thesis defense

rafael ortega tesis 1

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!

rafael ortega tesis 2

 

 

Epitaxial YBa2Cu3O7−x nanocomposite thin films from colloidal solutions

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.

29 November-4 December 2015: Oral Conference of Mariona Coll at 2015 MRS Fall Meeting, Boston, Massachusetts

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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

10-11 DEC: WORKSHOP on VORTEX PHYSICS OF STRAINED NANOCOMPOSITE FILMS

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

Institut de Ciència de Materials de Barcelona ICMAB CSIC

Address


Campus de la UAB, 08193 Bellaterra, Barcelona, Spain
+34 935 801 853 ext 371 
hr_suman@icmab.es