Friday, 2D-08, 4:20-4:30

Vortex-Defects Engineering of YBCO Films by All Chemical Nanostructuration Routes

Teresa Puig

Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB,08193 Bellaterra, Spain
Tel. +34 935802853, Fax +34 935805729, teresa.puig@icmab.es

Understanding vortex pinning mechanisms and correspondingly the interaction between vortices and defects is still one of the major goals to enhance properties of coated conductors and consequently fine control of the micro and nanostructure of the superconducting material is required. Therefore, the capability to artificially nanostructure superconducting material is a major goal, especially in chemical solution based films where less knowledge is acquired due to the infancy of the field. Our group has devoted much effort on growing, by chemical routes, superconducting nanocomposites with different second phases embedded in the YBCO matrix (BaZrO₃, Y₂O₃) as well as YBCO superconducting films on top of non-superconducting oxide nanostructured templates generated by strained induced self-assembled processes (La-Sr-O, Ce_1-xGd_xO₂). The pinning mechanisms associated to these nanostructured films have been thoroughly evaluated and correlated with the particular microstructure. Results will be discussed in terms of vortex contributions of the different pinning centers which have been separated and quantified in a wide temperature and magnetic field range. Recently, we have started to combine magnetic nanostructures with YBCO films and initial results will be presented.

We acknowledge financial support from MEC (MAT2005-02047, NAN2004-09133-C03-01, MAT2006-26543-E), Consolider Nanoselect, Generalitat de Catalunya (Pla de Recerca SGR-0029 and XaRMAE), CSIC(PIF-CANNAMUS) and EU (HIPERCHEM, NESPA)

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