High critical field anisotropy of superconducting Bi-Sr-Ca-Cu oxide from highly oriented thin films

Kang, J. H.; Kampwirth, R. T.; Gray, K. E.
June 1988
Applied Physics Letters;6/13/1988, Vol. 52 Issue 24, p2080
Academic Journal
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.


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