Transport and structural properties of thin (Bi, Pb)2Sr2Ca1Cu2O8+δ films prepared by DC sputtering

✍ Scribed by R. Henn; T. Kroener; J. Geerk; G. Linker; O. Meyer

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 546 KB
• Volume: 221
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)90247-x

✦ Synopsis

Superconducting thin films of the two CuO2 layer phase in the Pb-doped Bi-Sr-Ca-Cu-O system have been fabricated on (100) MgO and (100) SrTiO 3 substrates by DC magnetron sputtering and ex-situ annealing. The best films were prepared at annealing temperatures just below the melting temperature. On both substrates the 2212 films were grown with the c-axis perpendicular to the substrate surface. Rocking curves revealed mosaic distributions of the crystal grains between 0.3 ° and 0.8 ° underlining the highly textured growth of the films. Films on SrTiO3 showed in-plane epitaxial growth, while films on (100) MgO showed a random orientation in the a-b plane with four dominating growth directions. Weak links caused by different orientations in the a-b plane for films on MgO may be the reason for reduced transport properties compared to films on SrTiO3. Films on (100) SrTiO3 showed T¢ values up to 88 K, critical current densities in the range of 5 × 105 A/cm 2 at 4.2 K, while films on MgO reached Tc values up to 80 K andjc values up to 6× 104 A/cm 2.