Please use this identifier to cite or link to this item: http://hdl.handle.net/2307/382
Title: Effect of BaZrO3 Inclusions on the Microwave Surface Impedance of YBCOFilms in a Magnetic Field
Authors: Pompeo, Nicola
Rogai, Raffaella
Galluzzi, Valentina
Augieri, Andrea
Celentano, Giuseppe
Ciontea, Lelia
Petrisor, Traian
Silva, Enrico
Keywords: THIN-FILMS
TYPE II SUPERCONDUCTORS
DISSIPATION
RESONATORS
SURFACE RESISTANCE
VORTICES
Issue Date: 15-Jul-2009
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Abstract: We perform measurements of high-frequency (similar to 48 GHz) microwavesurface impedance with an applied magnetic field in YBa2Cu3O7-delta (YBCO) laser-ablated films with various amounts of BaZrO3 ( BZO)sub-micrometric inclusions, up to 7 mol % concentration. BZO inclusionsare very effective in the reduction of the field-induced surfaceresistance in our experimentally accessible field range [ 0, 0.8] T. Attemperatures low enough, the application of a moderate (similar to 0.2T) field makes the YBCO/BZO films markedly less dissipative than pureYBCO. This result, examined in the light of the very high measuringfrequency ( very small vortex oscillation amplitude) shows that BZOinclusions are even more effective pinning centers than columnardefects. We study the dependence of the vortex parameters ( vortexviscosity, pinning constant) on the BZO concentration. We examine thecorrelation between the reduction of the microwave dissipation and theareal density of BZO-induced defects. We argue that the very improvedperformances in a magnetic field are due to individual pinning ofvortices on BZO inclusions.
URI: http://hdl.handle.net/2307/382
ISSN: 1051-8223
DOI: 10.1109/TASC.2009.2019595
Appears in Collections:A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'

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