Transport Critical Current Densities in Uniaxially and Biaxially Oriented Tl_1 (Ba_<0.8>Sr_<0.2>)_2Ca_2Cu_3O_9 Superconducting Films on Ag and SrTiO_3 Substrates Prepared by a Spray Pyrolysis Method

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Tl_1(Ba_<0.8>Sr_<0.2>)_2Ca_2Cu_3O_9 films were prepared by a spray pyrolysis method on SrTiO_3(100) single crystal substrates and on polycrystalline Ag tapes. The biaxially (c- and a-axes) oriented Tl_1(Ba_<0.8>Sr_<0.2>)_2Ca_2Cu_3O_9 film on SrTiO_3 single crystal substrate showed very high performance of the transport J_c, i.e. 2.8×10^5 A/cm^2 at 77 K, 0 T and 5.0×10^4 A/cm^2 at 77 K, 1 T (H⫽c-axis). In contrast, the c-axis oriented film was obtained on Ag tape with the J_c of 8.0×10^4 A/cm^2, at 77 K, O T, and of 6.9×10^3 A/cm^2, at 77 K, 1 T (H⫽c-axis). In the c-axis oriented Tl_1 (Ba_<0.8>Sr_<0.2>)_2 Ca_2Cu_3O_9 film, the weak link behavior remained, however the weak magnetic field dependence of the J_c and the very high J_c in the biaxially oriented film suggested that the weak link problem was eliminated. We concluded it would be necessary to get the biaxial orientation to produce practical wires of Tl-1223.
社団法人応用物理学会の論文
1994-10-15