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http://hdl.handle.net/2307/382
Cinwaan: | Effect of BaZrO3 Inclusions on the Microwave Surface Impedance of YBCOFilms in a Magnetic Field | Qore: | Pompeo, Nicola Rogai, Raffaella Galluzzi, Valentina Augieri, Andrea Celentano, Giuseppe Ciontea, Lelia Petrisor, Traian Silva, Enrico |
Ereyga furaha: | THIN-FILMS TYPE II SUPERCONDUCTORS DISSIPATION RESONATORS SURFACE RESISTANCE VORTICES |
Taariikhda qoraalka: | 15-Jul-2009 | Tifaftire: | 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 |
Wuxuu ka dhex muuqdaa ururinnada: | A - Articolo su rivista X_Dipartimento di Fisica 'Edoardo Amaldi' |
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