Enhancement of the superconducting properties of TlBa2CaCu2O7+δ thin films via postannealing
1995; American Institute of Physics; Volume: 67; Issue: 26 Linguagem: Inglês
10.1063/1.114420
ISSN1520-8842
AutoresMichael P. Siegal, E.L. Venturini, P.P. Newcomer, B. Morosin, D. L. Overmyer, F. Domínguez, R.G. Dunn,
Tópico(s)Microwave Dielectric Ceramics Synthesis
ResumoThe superconducting properties of TlBa2CaCu2O7+δ(Tl-1212) films are greatly enhanced by annealing in unreactive ambients such as nitrogen at temperatures ranging from Ta=250–600 °C. The transition temperature, Tc, of these Tl-1212 films as-grown in oxygen is 70 K. Annealing for 1 h at 250 °C elevates Tc above 90 K. Tc further increases and sharpens for Ta=600 °C. In addition, subtle changes occur in the microstructure correlating with improved critical current density. These results indicate that Tl-1212 films may be of greater relevance for electronics applications than previously believed.
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