High critical field anisotropy of superconducting Bi-Sr-Ca-Cu oxide from highly oriented thin films
- 13 June 1988
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 52 (24), 2080-2082
- https://doi.org/10.1063/1.99753
Abstract
Superconducting films of Bi-Sr-Ca-Cu oxides have been grown on MgO substrates by multitarget magnetron sputtering. After post-annealing in an oxygen atmosphere, zero resistance was obtained at about 80 K. X-ray diffraction indicates a high degree of preferential growth of the c axis perpendicular to the substrate. Measurements of the upper critical field Bc2(T) of these films show critical field slopes (B′c2≡−dBc2/dT at Tc) of 8.5 and 0.56 T/K, respectively, for B parallel and perpendicular to the substrate. The anisotropy of ∼15 and the Bc2∥ are the highest values yet reported for high-temperature superconductors.Keywords
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