Superconductivity in BiSrCaCuO films made by spray pyrolysis

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

doi:10.1016/0038-1098(89)90576-0

Cited by 10 publications

(4 citation statements)

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“…Single-phase 2212 Bi-Sr-Ca-Cu-O films with Tc (R =0) 80K were prepared on MgO (100) substrate by spray-pyrolysis technique (Walia et al 1989). Mixed-phase (predominently high Tc phase) Bi-Sr-Ca-Cu-O films were prepared using screenprinting technique with the starting composition 1112 (Chaudhry et al 1990).…”

Section: Methodsmentioning

confidence: 99%

Study of galvanomagnetic effects in Bi-Sr-Ca-Cu-O films

et al. 1991

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Galvanomagnetic effect has been studied at 77 K on Bi-Sr-Ca-Cu-O films as a function of d.c. bias current. These films were prepared by spray pyrolysis and scrcenprinting techniques, with 7~ (R = 0) 80 K and 100 K respectively. Magnetic field dependence of Ic of sprayed-film showed very small hysteresis whereas screen-printed film showed greater hysteresis. Application of small magnetic field on these films destroyed the zero-resistance state and a finite resistance was developed. The slope of the resistance vs magnetic field curve AR/AH depended on the current flowing through the sample. To increase AR/AH, meander-shape pattern was prepared on the sprayed film. In general AR/AH increased by a factor of 103 after sample patterning. The possibility of using these films as a sensitive magnetic field sensor is discussed.

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Section: Methodsmentioning

confidence: 99%

Study of galvanomagnetic effects in Bi-Sr-Ca-Cu-O films

et al. 1991

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“…The films were prepared using the experimental set-up for spraying as described elsewhere (Walia et al 1989). The aqueous solution containing nitrates of bismuth, strontium, calcium and copper in the atomic ratio of 2212 was prepared by dissolving a suitable amount of bismuth oxide, strontium carbonate, calcium carbonate, and copper oxide in a dilute solution of nitric acid with 25~o methanol to enhance the speed of evaporation during deposition.…”

Section: Methodsmentioning

confidence: 99%

“…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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“…Spray pyrolysis has been used for preparing hightemperature superconductors almost since their discovery over 10 years ago [4][5][6][7][8]. Until recently, however, the usual approach has involved deposition at low temperature, followed by a high-temperature anneal to form the superconducting phase.…”

Section: Introductionmentioning

confidence: 99%

Spray pyrolysis of epitaxial YBCO films on (100) single crystal SrTiO₃substrates

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et al. 2001

Supercond. Sci. Technol.

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Biaxially textured films of YBa 2 Cu 3 O 7−∂ have been deposited in situ on (100) single crystal SrTiO 3 substrates by a one step spray pyrolysis process. Good out-of-plane (FWHM = 0.4 • ) and in-plane (FWHM = 8 • ) textures have been achieved for films grown at temperatures between 800 • C and 900 • C, at atmospheric pressure. The ac susceptibility measurements have shown that the films have T c onsets of 90 K without the need of a subsequent oxygenation procedure. Magneto-optic imaging studies have indicated that the films are homogeneous, well connected and crack free. Calculations from magnetization hysteresis loops have shown that the films can have J c values as high as 1.9 × 10 5 A cm −2 at 77 K in zero field.

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Superconductivity in BiSrCaCuO films made by spray pyrolysis

Cited by 10 publications

References 14 publications

Study of galvanomagnetic effects in Bi-Sr-Ca-Cu-O films

Study of galvanomagnetic effects in Bi-Sr-Ca-Cu-O films

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

Spray pyrolysis of epitaxial YBCO films on (100) single crystal SrTiO₃substrates

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Superconductivity in BiSrCaCuO films made by spray pyrolysis

Cited by 10 publications

References 14 publications

Study of galvanomagnetic effects in Bi-Sr-Ca-Cu-O films

Study of galvanomagnetic effects in Bi-Sr-Ca-Cu-O films

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

Spray pyrolysis of epitaxial YBCO films on (100) single crystal SrTiO3substrates

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Spray pyrolysis of epitaxial YBCO films on (100) single crystal SrTiO₃substrates