GROWTH OF SUPERCONDUCTING THICK FILMS OF YBaCuO BY SPRAY PYROLYSIS TECHNIQUE AND STUDY OF QUANTUM INTERFERENCE EFFECTS

Reddy, G S N; Gupta, Anurag; Ojha, V. N.; Walia, D K; Kataria, N. D.; Khare, Neeraj; Tomar, V S

doi:10.1142/s0217984989001989

Cited by 6 publications

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“…The film formation accompanies the decomposition process. The method is used for preparing Y-Ba-Ca--Cu-O (Reddy et al 1989) and Bi-Sr-Ca-Cu O (Walia et al 1989) films.…”

Section: Introductionmentioning

confidence: 99%

Study of Josephson effects in microbridges of Bi-Sr-Ca-Cu-O films made by spray pyrolysis

et al. 1991

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Superconducting Bi-Sr-Ca-Cu-O (22121 films were prepared by spraying stoichiometric aqueous solutions of nitrates of bismuth, strontium, calcium and copper on heated MgO (100) substrates and subsequent annealing in air. The R-T curves of the films show metallic behaviour above the superconducting transition temperature. Tc (R = 0) is observed between 80 and 85 K. Annealing temperature has a profound effect on Tc (R = 0) and on the orientation of the film. Annealing in air in near-melting region yields highly oriented films with c-axis perpendicular to the substrate. These films show a sharp superconducting transition with zero resistance at 85 K. Microbridges of the dimensions of 50/~m × 50#m have been patterned photolithographically followed with chemical etching. The I V characteristics of the microbridges show Josephson efl,~cts due to the presence of grain boundary weaklinks. The temperature dependence of the critical current for these microbridges suggest formation of superconductor-normal-superconductor type weaklinks.

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“…The film formation accompanies the decomposition process. The method is used for preparing Y-Ba-Ca--Cu-O (Reddy et al 1989) and Bi-Sr-Ca-Cu O (Walia et al 1989) films.…”

Section: Introductionmentioning

confidence: 99%