Abstract: Provided is an oxide superconductor composition that makes it possible to increase film thickness, increase production speed, and decrease costs when producing a REBaCuO-type oxide superconductor wire (wherein RE is at least one element selected from the group consisting of Y, Nd, Sm, Gd, Dy, Eu, Er, Yb, Pr, and Ho). The oxide superconductor comprises, as essential components thereof, an RE salt of a carboxylic acid that serves as an RE component, that does not contain a ketone group, and that has 3-8 carbon atoms, barium trifluoroacetate that serves as a Ba component, one or more copper salts that serve as a Cu component and that are selected from the group consisting of copper salts of branched saturated aliphatic carboxylic acids having 6-16 carbon atoms and copper salts of alicyclic carboxylic acids having 6-16 carbon atoms, and an organic solvent that dissolves the aforementioned metal salt components.

Abstract: An RE123-based superconducting wire of the invention includes: a substrate; an intermediate layer provided above the substrate; and an oxide superconducting layer that is provided above the intermediate layer and is made of an oxide superconductor expressed by a composition formula of RE1Ba2Cu3O7-? where RE represents one kind of or two or more kinds of rare earth elements in the formula, wherein an Hf-containing compound of 0.5 to 10 mol % is introduced into the oxide superconducting layer, a different phase containing Hf is dispersed in the oxide superconducting layer as a flux pinning center, and the a-axial-ratio of the oxide superconducting layer is less than or equal to 1.5%.

Abstract: Provided is a substrate for superconductive film formation, which includes a metal substrate, and an oxide layer formed directly on the metal substrate, containing chromium oxide as a major component and having a thickness of 10-300 nm and an arithmetic average roughness Ra of not more than 50 nm. A method of manufacturing a substrate for superconductive film formation, which includes forming an oxide layer directly on a metal substrate, the oxide layer containing chromium oxide as a major component and having a thickness of 10-300 nm and an arithmetic average roughness Ra of not more than 50 nm.

Abstract: An RE123-based superconducting wire includes a base material, an intermediate layer formed on the base material, and an oxide superconducting layer which is formed on the intermediate layer and includes an oxide superconductor having a composition formula represented by RE1Ba2Cu3O7?? (RE represents one or two or more rare earth elements), in which the oxide superconducting layer includes 0.5 to 10 mol % of a Hf-including compound dispersed in the oxide superconducting layer as an artificial pinning center, a film thickness d of the oxide superconducting layer is d>1 ?m, and a current characteristic of Jcd/Jc1?0.9 (Jc1 represents a critical current density when the thickness of the oxide superconducting layer is 1 ?m, and Jcd represents the critical current density when the thickness of the oxide superconducting layer is d ?m) is satisfied.

Abstract: Provided is an oxide superconducting wire material, wherein pinning of magnetic flux, under an environment in which magnetic field is applied, can be conducted efficiently towards any magnetic-field applying angle direction, to secure a high superconductive property. The oxide superconducting wire material (100) is provided with a metal substrate (110), an intermediate layer (120) formed upon the metal substrate (110), and a REBaCuO-system superconductive layer (140) formed upon the intermediate layer (120). RE comprises one or more elements selected from Y, Nd, Sm, Eu, Gd, and Ho. Oxide particles including Zr are distributed within the superconductive layer (140) as magnetic-flux pinning points (145), and the mole ratio (y) of Ba included within the superconductive layer (140) is, when the mole ratio of Zr is assumed to be x, within a range of (1.2+ax)?y?(1.8+ax), wherein 0.5?a?2.

Abstract: A substrate for an oxide superconductor including: a metal base; an interlayer of MgO formed on the metal base by ion beam assisted deposition method (IBAD METHOD); and a cap layer that is formed directly on the interlayer and has a higher degree of crystal orientation than that of the interlayer, in which the interlayer of MgO is subjected to a humidity treatment prior to formation of the cap layer.

Abstract: An oxide superconducting tape comprised of a substrate on which a GdBa2Cu3O7-? (?=0 to 1) superconductor layer is formed, characterized in that, inside of said superconductor layer, columnar or rod-shaped BaZrO3 crystals are dispersed such that they are inclined from c-axis of the superconducting crystals and that BaZrO3 crystals adjacent in longitudinal directions are in a skew position.

Abstract: Provided is a substrate for superconductive film formation, which includes a metal substrate, and an oxide layer formed directly on the metal substrate, containing chromium oxide as a major component and having a thickness of 10-300 nm and an arithmetic average roughness Ra of not more than 50 nm. A method of manufacturing a substrate for superconductive film formation, which includes forming an oxide layer directly on a metal substrate, the oxide layer containing chromium oxide as a major component and having a thickness of 10-300 nm and an arithmetic average roughness Ra of not more than 50 nm.

Abstract: The present invention relates to a rare earth element oxide superconductive wire material improved in orientation by forming the bed layer by the MOD method. In the superconductive wire material (10) produced by forming a MOD-CZO layer (2), an IBS-GZO (3), an IBAD-MgO layer (4), a LMO layer (5), a PLD-CeO2 layer (6) and a PLD-GdBCO superconductive layer (8) in this order on an electropolished substrate (1) in an oxygen atmosphere, the CeO2 layer has a value of ??=4.2 degrees, which is almost the same as in the case of using a mechanically polished substrate, and the GdBCO super conductive layer has a value of Ic=243 A (Jc=up to 5 MA/cm2), which is almost the same as in the case of using a mechanically polished substrate.

Abstract: 100-800 nm ReBCO films with critical current density (Jc) values in excess of 1 MA/cm2 were fabricated from aqueous nitrate precursor solutions with additives. Additives such as polyethylene glycol (PEG) and sucrose were selected to suppress crystallization of barium nitrate. This produces higher concentration solutions resulting in thicker crack-free single layers. Additional water-soluble viscosity modifiers, such as polyvinyl alcohol (PVA) or cellulose-derivatives, were used to increase thickness and allow wetting of ceramic surfaces. Water vapor present at higher temperatures during heat-treatment damaged the films, while the role of water vapor at lower temperatures is still under investigation.

Abstract: This invention provides a production process of a tape-shaped superconductor which can realize high Jc and Ic values by virtue of the elimination of the cause of generation of cracks and deterioration of an electrical connectivity in crystal grain boundaries. In producing an Re-base (123) superconductor on a substrate by an MAD process, the use of a raw material solution having a Re:Ba:Cu molar ratio of 1:X:3, wherein X is a Ba molar ratio satisfying X<2 (preferably 1.0?X?1.8, especially 1.3?x?1.7), can realize the production of a thick-film tape-shaped superconductor having a superconductivity of Jc=3.20 MA/cm2 and Ic=525 A/cm (X=1.5).