Process for producing thallium type superconducting thin film

Details Process for producing thallium type superconducting thin film Process for producing thallium type superconducting thin film

Filed on

1991-07-30

Date issued

1993-03-23

Examiner

Beck, Shrive

Patent Class

Superconductor technology: apparatus, material, process

SubClass

High temperature , per se

SubSubClass

Having tc greater than or equal to 150 k

Other Related Categories

505731, 505732, 505742, 427 62, 427343, B05D 512

Type

Patent

Status

active

Patent number

051963981

Description

ABSTRACT:
Improvement in heat-treatment of a superconducting thin film of thallium type compound oxide deposited on a substrate by PVD or CVD. In the invention, the heat-treatment is effected at a temperature between 880.degree. C. and 920.degree. C. for a predetermined time duration under such a condition that the partial pressure of thallium oxide becomes higher than the saturated vapour pressure of thallium oxide at said temperature.

REFERENCES:
Yamada et al, "Bulk and wire type Y-Ba-Cu oxide Superconductor" Jpn. J. Appl. Phys. 26 Oct. 1987, Supplement 26-3.
Shih et al, "Multilayer deposition of Tl-Ba-Ca-Cu-O films" Appl. Phys. Lett. 53(6) Aug. 8, 1988 pp. 523-525.
Lee et al, "Superconducting Tl-Ca-Ba-Cu-O thin films with zero resistance at temperatures of up to 120k" Appl. Phys. Lett. 53(4) Jul. 1988 pp. 329-331.
Ginley et al, "Sequential electron beam evaporated films of Tl.sub.2 CaBa.sub.2 Cu.sub.2 Oy with zero resistance at 97k", Appl. Phys. Lett. 53(5) Aug. 1, 1988 pp. 406-408.
Ichikawa et al, "Highly oriented superconducting Tl-Ca-Ba-Cu oxide thin films with 2-1-2-2 phase", Appl. Phys. Lett. 53(10) Sep. 1988 pp. 919-921.
Kang et al, "Large anistropy in the upper critical field of sputtered thin films of superconducting Tl-Ba-Ca-Cu-O", Appl. Phys. Lett. 53(25) Dec. 1988, pp. 2560-2562.
Z. Z. Sheng et al., Applied Physics Letters, "T1203 vapor process of making Tl-Ba-Ca-Cu-O superconductors"; (Dec. 1988); pp. 2686-2688.
R. W. Simon et al., Applied Physics Letters, "Low-loss substrate for epitaxial growth of high-temperature superconductor thin films"; (Dec. 1988): pp. 2677-2679.

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