Superconducting thin film having a matrix and foreign phases

Details Superconducting thin film having a matrix and foreign phases Superconducting thin film having a matrix and foreign phases

1990-12-07

1993-05-18

Beck, Shrive

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505701, 505732, 428930, 428702, 427 62, 427596, H01L 3900

Patent

active

052121518

ABSTRACT:
An oxide superconducting thin film formed by laser ablation comprises a matrix formed of c-axis oriented superconducting phases and foreign phases which are different in crystal orientation from the matrix. In order to improve critical current density of the oxide superconducting thin film, preferably selected are such conditions that the size of each superconducting phase in its a-b plane is not more than 0.1 .mu.m in diameter, the size of each superconducting phase along its c-axis direction is equal to the thickness of the oxide superconducting thin film, the foreign phases at least partially pass through the oxide superconducting thin film along the direction of thickness, the size of each foreign phase is at least 0.01 .mu.m and not more than 5 .mu.m in diameter, each foreign phase has an a-axis or a c-axis perpendicularly oriented with respect to the major surface of the oxide superconducting thin film, and the like.

REFERENCES:
X. D. Wu et al., "Versatility of pulsed laser deposition technique for preparation of high Tc superconducting thin film" SPIE, vol. 948, High-Tc Superconductivity: Thin Films and Devices, Mar. 1988 Washington, US; pp. 50-65.
Yamane et al., "High Tc superconducting oxide films prepared by CVD", Adv. in Superconductivity II, (ISS'89) (Tokyo, Japan) Nov. 14-17, 1989 pp. 767-772.
Wu et al., "Large critical current densities in YBa.sub.2 Cu.sub.3 O.sub.7-x thin films made at high deposition rates", Appl. Phys. lett. 57(5) Jul. 1990, pp. 523-525.
Venkatesan et al., "High-temperature superconductivity in ultrathin films of Y.sub.1 Ba.sub.2 Cu.sub.3 O.sub.7-x ", Appl. Phys. lett. 54(6) Feb. 1989, pp. 581-583.
Roas et al., "Irradiation-induced enhancement of the critical current density of epitaxial YBa.sub.2 Cu.sub.3 O.sub.7-x thin films", Appl. Phys. lett. 54(11) Mar. 1989 pp. 1051-1053.
Singh et al., "Nature of epitaxial growth of high-Tc laser-deposted Y-Ba-Cu-O films on (100) Strontium titanate substrates" J. Apply. Phys. 67(8) Apr. 1990 pp. 3785-3790.

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