DC sputtered high-temperature superconducting thin films in the Bi-Sr-Ca-Cu-O system
A Perrin; Z Z Li; O Pena; J Pinel; J Padiou; M Sergent; A Perrin; Lab. de Chimie Minerale B, Rennes Univ., France; Z Z Li; Lab. de Chimie Minerale B, Rennes Univ., France; O Pena; Lab. de Chimie Minerale B, Rennes Univ., France; J Pinel; Lab. de Chimie Minerale B, Rennes Univ., France; J Padiou; Lab. de Chimie Minerale B, Rennes Univ., France; M Sergent; Lab. de Chimie Minerale B, Rennes Univ., France
Журнал:
Superconductor Science and Technology
Дата:
1988-12-01
Аннотация:
High-T<sub>c</sub> superconducting thin films have been successfully obtained from single-target DC sputtering deposition followed by an appropriate annealing. Sapphire and (100) SrTiO<sub>3</sub> substrates were used. In the latter case, strongly oriented c-axis films were obtained. For the nominal composition 2:2:1:2 the films exhibit a strong metallic behaviour in the normal state and a sharp superconducting transition, with an onset around 84 K. The critical current density is at least 2*10<sup>3</sup> A cm<sup>-2</sup> at 70 K. For the composition 1:1:1:2 a kink in the R(T) curve clearly appears near 110 K. This transition appears especially sensitive to thermal treatment.
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