Preparation of superconducting Bi-Sr-Ca-Cu-O thin films by sequential electron beam evaporation and oxygen annealing
- 30 January 1989
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 54 (5) , 466-468
- https://doi.org/10.1063/1.101457
Abstract
Superconducting films with nominal composition Bi2Sr2Ca1Cu2Ox have been prepared on 〈100〉 MgO substrates by sequential electron beam evaporation of Cu, Bi, and Sr2/3 Ca1/3 F2, followed by annealing in flowing wet, then dry, O2. X‐ray diffraction data show that the films contain the two Bi‐Sr‐Ca‐Cu‐O phases that have been identified in the literature as a superconducting phase with c∼31 Å and a semiconducting phase with c∼24 Å. Both phases are strongly textured with the c axis perpendicular to the substrate. For the best film, which was annealed at 870 °C for 30 min, zero resistance was observed at 90 K, and the critical current density increased from 0.8×105 A/cm2 at 77 K to 2.3×105 A/cm2 at 4.2 K.Keywords
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