Ultrasonic Study of YBa2Cu3O7-x Superconductors

In-Plane Anisotropy of the Penetration Depth in YBa2Cu3O7-x and YBa2Cu4O8 Superconductors.

D. N. Basov,1 R. Liang,2 D. A. Bonn,2 W. N. Hardy,2 B. Dabrowski,4 M. Quijada,3 D. B. Tanner,3 J. P. Rice,5 D. M. Ginsberg,5 and T. Timusk1 1Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1 2Department of Physics, University of British Columbia, Vancouver, British Columbia, Canada V6T 4M1 3Department of Physics, University of Florida, Gainesville, Flor...

Nano-composite single grain YBa2Cu3O7-δ / Y2Ba4CuBiOy bulk superconductors

We have succeeded recently in synthesizing a chemically stable, inert family of materials of composition Y2Ba4CuMOy (Y-2411 where M = Nb, Ta, Mo, W, Zr, Hf) within the superconducting YBa2Cu3O7-δ• (Y-123) phase matrix that forms effective flux pinning centers of nano-scale dimensions. In this paper we report the synthesis of the Y2Ba4CuBiOy phase with nano-scale dimensions that is similarly com...

EFFECTS OF EPITAXIAL STRAIN ON THE GROWTH MECHANISM OF YBa2Cu3O7−x THIN FILMS IN [YBa2Cu3O7−x/PrBa2Cu3O7−x] SUPERLATTICES

We report on the growth mechanism of YBa2Cu3O7−x. Our study is based on the analysis of ultrathin, YBa2Cu3O7−x layers in c-axis oriented YBa2Cu3O7−x / PrBa2Cu3O7 superlattices. We have found that the release of epitaxial strain in very thin YBCO layers triggers a change in the dimensionality of the growth mode. Ultrathin, epitaxially strained, YBCO layers with thickness below 3 unit cells grow ...

بررسی خواص مغناطیسی ابررسانای سرامیکی Yba2Cu3O7-x/Ag

Ultrasonic attenuation measurements in sinter-forged YBa2Cu3O7-b