Three-dimensional superconductivity of the structurally two-dimensional superconductor La1.87Y0.13CuO4: study of an angle-dependent critical current density
Abstract
The angular dependence of the critical current density (Jc(θ)) of La1.87Y0.13CuO4 was measured at different fields and temperatures. Jc(θ) showed a strong angular variation, which is typical for uniaxial anisotropic superconductors. Although La1.87Y0.13CuO4 has a quasi-two-dimensional (2D) crystal structure, the angular variation could be consistently described using the usual anisotropic three-dimensional (3D) Ginzburg-Landau theory with a small anisotropy ratio, but not by Tinkham's multi-layer model, which is known to be suitable for describing quasi-2D superconductors. These results indicate that the 2D crystallographic structure plays a minor role in La1.87Y0.13CuO4 because of the elongated c axis coherence length. From our analysis, we were also able to estimate the anisotropy ratio, the ab plane, and the c axis coherence length.
- Publication:
-
Superconductor Science Technology
- Pub Date:
- July 2005
- DOI:
- 10.1088/0953-2048/18/7/003
- Bibcode:
- 2005SuScT..18..944L