Abstract: A precursor for Nb3Sn single-core superconducting wire includes a Sn-based wire rod, a first Cu-based tube covering an outer circumferential surface of the Sn-based wire rod, an Nb-based tube covering an outer surface of the first Cu-based tube, and a second Cu-based tube covering an outer surface of the Nb-based tube. The Sn-based wire rod contains a matrix phase and at least one kind of hard phases that is harder than the matrix phase. In a cross section parallel to a longitudinal direction of the precursor for Nb3Sn single-core superconducting wire, a maximum dimension of the hard phases in a width direction perpendicular to the longitudinal direction is 50% or less of a minimum dimension in the width direction of the Sn-based wire rod and/or is equal to or smaller than a minimum thickness in the width direction of the Nb-based tube.

Abstract: Provided is a connection structure for superconductor wires, in which two superconductor wires include respective oxide superconducting conductor layers each formed on one surface of a base material. The oxide superconducting conductor layers are conjoined with each other while facing each other at a connected end of each of the two superconductor wires. An embedment material for reinforcement is provided from one of the two superconductor wires to the other one of the two superconductor wires in a thickness direction of the two superconductor wires at the connected end of each of the two superconductor wires.

Abstract: A superconducting wire rod according to an aspect of the present disclosure is a superconducting wire rod having a flat cross-sectional shape which is characterized in that a voltage is generated with a lower current density or a higher voltage is generated with the same current density in a region on at least one end side in a wire rod width direction as compared with a region other than the region on the at least one end side.

Abstract: A connection structure of the present disclosure includes first and second superconducting wires that are two superconducting wires each having a substrate in a tape shape, an intermediate layer formed on the substrate, and a superconductor layer formed on the intermediate layer, a connecting superconductor layer that connects the first and second superconducting wires in a positional relationship in which surfaces of the superconductor layers face each other, and forms a superconducting connecting section together with the first and second superconducting wires, two protective members each having a width larger than a width of the first and second superconducting wires and disposed on substrates sides of the first and second superconducting wires in a positional relationship of sandwiching the superconducting connecting section, and a metal part that joins the two protective members to each other.

Abstract: A connection structure of superconducting wires includes a plurality of superconducting wires are overlapped and connected with each other, each of the plurality of superconducting wires including a substrate and a superconducting layer that are laminated. A non-superconductor is provided at a part of a surface of the superconducting layer of at least one of the superconducting wires and protrudes from the surface.

Abstract: Provided is a connection structure for superconductor wires, in which two superconductor wires include respective oxide superconducting conductor layers each formed on one surface of a base material. The oxide superconducting conductor layers are conjoined with each other while facing each other at a connected end of each of the two superconductor wires. An embedment material for reinforcement is provided from one of the two superconductor wires to the other one of the two superconductor wires in a thickness direction of the two superconductor wires at the connected end of each of the two superconductor wires.

Abstract: A superconducting wire rod according to an aspect of the present disclosure is a superconducting wire rod having a flat cross-sectional shape which is characterized in that a voltage is generated with a lower current density or a higher voltage is generated with the same current density in a region on at least one end side in a wire rod width direction as compared with a region other than the region on the at least one end side.

Abstract: A connection structure of superconducting wires includes a plurality of superconducting wires are overlapped and connected with each other, each of the plurality of superconducting wires including a substrate and a superconducting layer that are laminated. A non-superconductor is provided at a part of a surface of the superconducting layer of at least one of the superconducting wires and protrudes from the surface.

Abstract: A superconducting thin film having excellent critical current characteristics is provided. A substrate for a superconducting thin film includes a substrate body (10A) having a main surface (10B) in which the root mean square slope R?q of a roughness curve is 0.4 or less.

Abstract: A superconductive wire material substrate which is formed such that a surface roughness Ra of one surface is 10 nm or less, and a surface roughness Ra of an other surface is larger than the surface roughness Ra of the one surface, and is 8 nm or more and less than 15 nm, between the surface roughnesses Ra of both surfaces of the superconductive wire material substrate.

Abstract: A superconducting wire is provided which allows an appropriate critical current property to be obtained while maintaining high adhesive strength based on smoothness of a substrate surface that can be achieved without mechanical polishing or the like. A first intermediate layer 21 is formed by coating a material solution on a substrate 10 with a maximum height roughness Rz of 10 nm or more. This improves surface smoothness of the first intermediate layer 21, improves orientation and smoothness of a second intermediate layer 22 formed on the first intermediate layer 21, and increases a critical current in an oxide superconducting layer 30. Furthermore, the first intermediate layer 21 is formed of a plurality of thin coating film layers 21i.

Abstract: Adhesiveness between a metallic substrate and a metal oxide layer is made to increase. A superconducting thin film (1) includes a metallic substrate (10), a metallic layer (22) that is formed on a main surface of the metallic substrate (10) and includes a metal element capable of being passivated as a main component, a metal oxide layer (24) that is formed on the metallic layer (22) and includes the passivated metal element as a main component, and a superconducting layer (40) that is formed on the metal oxide layer (24) directly or through an intermediate layer and includes an oxide superconductor as a main component.

Abstract: A method for producing a superconductive conductor includes: a base material preparation process of preparing a base material having a groove formed on at least one face thereof; a superconducting layer formation process of forming a superconducting layer on a surface of the base material at a side at which the groove is formed; and a cutting process of cutting completely through the base material along the groove.

Abstract: A tape-shaped superconducting film-forming substrate is disclosed, which includes a film-forming face for forming a laminate including a superconducting layer thereon, a rear face that is a face at a side opposite to the film-forming face, a pair of end faces connected to the film-forming face and the rear face, and a pair of side faces connected to the film-forming face, the rear face, and the pair of end faces, in which each of the pair of side faces includes a spreading face that spreads toward an outer side in an in-plane direction of the film-forming face from an edge part of the film-forming face toward the rear face side. A superconducting wire and a superconducting wire manufacturing method are also disclosed.

Abstract: A tape-shaped superconducting film-forming substrate is disclosed, which includes a film-forming face for forming a laminate including a superconducting layer thereon, a rear face that is a face at a side opposite to the film-forming face, a pair of end faces connected to the film-forming face and the rear face, and a pair of side faces connected to the film-forming face, the rear face, and the pair of end faces, in which each of the pair of side faces includes a spreading face that spreads toward an outer side in an in-plane direction of the film-forming face from an edge part of the film-forming face toward the rear face side. A superconducting wire and a superconducting wire manufacturing method are also disclosed.

Abstract: A superconducting wire has: a substrate; a superconducting layer that is layered on one main surface side of the substrate; a stabilization layer that covers a surface of the superconducting layer and another main surface of the substrate; and an insulating layer that covers a surface of the stabilization layer, and that has an identification portion that identifies the substrate side and the superconducting layer side.

Abstract: Provided is a less expensive and high-performance superconductive wire material substrate, a method of manufacturing the less expensive and high-performance superconductive wire material substrate, and a superconductive wire material using the less expensive and high-performance superconductive wire material substrate. A superconductive wire material substrate 1 is formed such that a surface roughness Ra of one surface is 10 nm or less, and a surface roughness Ra of an other surface is larger than the surface roughness Ra of the one surface, and is 8 nm or more and less than 15 nm, between the surface roughnesses Ra of both surfaces of the superconductive wire material substrate 1.

Abstract: An effect of suppressing diffusion of metal elements from a substrate is high and orientation of a forcibly-oriented layer is improved. A base material (2) for a superconducting thin film includes: a substrate (10) including a metal element; a bed layer (22) formed on a surface of the substrate (10), the bed layer (22) including, as a main component, a non-orientated spinel compound that has a spinel type crystal structure and includes at least one transition metal element, Mg, and oxygen; and a forcibly-oriented layer (24) formed on a surface of the bed layer (22), the forcibly-oriented layer (24) having biaxial orientation and including, as a main component, a rock salt type compound that has a rock salt type crystal structure and includes Mg.

Abstract: A superconducting thin film having excellent critical current characteristics is provided. A substrate for a superconducting thin film includes a substrate body (10A) having a main surface (10B) in which the root mean square slope R?q of a roughness curve is 0.4 or less.

Abstract: A method for producing a superconductive conductor includes: a base material preparation process of preparing a base material having a groove formed on at least one face thereof; a superconducting layer formation process of forming a superconducting layer on a surface of the base material at a side at which the groove is formed; and a cutting process of cutting completely through the base material along the groove.