Superconducting wire

Abstract

Provided is a superconducting wire which, while maintaining smoothness of a substrate surface and high adhesive strength which can be implemented without carrying out a mechanical polishing, etc., makes it possible to obtain a desirable critical current. A first intermediate layer (21) is formed by coating a substrate (10) having a maximum height roughness (Rz) of 10nm or more with a material solution, surface smoothness of the first intermediate layer (21) is increased, orientation and smoothness of a second intermediate layer (22) which is formed upon the first intermediate layer, and a critical current of an oxide semiconductor layer (30) is increased. Forming the first intermediate layer (21) with a plurality of coated thin film layers (21i), having an uppermost layer coated thin film layer thickness which is thinner than a coated thin film layer thickness of the lowermost layer, and / or the material solution which is used in the uppermost coated thin film layer having a lower viscosity than the material solution which is used in the lowermost coated thin film layer, increases the surface smoothness of the first intermediate layer (21).

Description

technical field [0001] The present invention relates to a superconducting wire with an intermediate layer and a superconducting layer formed on a substrate, in particular to an intermediate layer whose smoothness is better than that of the substrate surface so that good critical current characteristics (high critical current characteristics) can be obtained. current) superconducting wires. Background technique [0002] In order to obtain the required strength, flexibility, etc. as a wire, a general superconducting wire has a structure as follows: for example, a metal tape or the like is used as a substrate, and an oxide layer (one or more layers) is formed on the substrate as an intermediate layer. layer, and then a superconducting layer composed of an oxide superconductor is formed on the intermediate layer, and a protective layer (also called a stabilizing layers). [0003] The critical current in a superconducting wire depends on the in-plane orientation of the supercon...

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Problems solved by technology

[0012] However, the polishing process of the substrate is a major factor leading to an increase in the manufacturing cost of the superconducting wire, and there is a problem that, in mechanical polishing, it is undeniable that the yield decreases due to local poor polishing.

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