A superconducting device which includes a substrate, multiple niobium leads formed on the substrate, a niobium silicide (NbSi.sub.x) passivation layer formed on a surface of at least one of the multiple niobium leads, and an aluminum lead formed directly on at least a portion of the NbSi.sub.x passivation layer such that an interface therebetween is substantially free of oxygen and oxidized material, where the multiple niobium leads and the aluminum lead are constructed to carry a supercurrent while in use.

A composition comprises one or more continuous fibers embedded in a high temperature superconducting material.

According to an embodiment of the present invention, a method for fabricating a Majorana fermion structure includes providing a substrate, and depositing a superconducting material on the substrate. The method includes depositing a magnetic material on the superconducting material using angled deposition through a mask. The method includes annealing the magnetic material and the superconducting material to form a magnetic nanowire partially embedded in the superconducting material such that the magnetic nanowire and the superconducting material form a Majorana fermion structure.

An insulation-coated compound superconducting wire includes a compound superconducting wire having a compound superconducting part which includes a first matrix and a plurality of compound superconducting filaments containing compound superconducting phases, a reinforcing part disposed on the outer circumferential side of the compound superconducting part and includes a plurality of reinforced filaments, a second matrix and a second stabilizing material. A stabilizing part is disposed on at least one side among the inner circumferential side and the outer circumferential side of the reinforcing part. An electrical insulation part covers the outer circumferential surface of the compound superconducting wire, in which the insulation-coated compound superconducting wire has a critical current value (Ic) larger than that of the compound superconducting wire before being covered with the electrical insulation part.

The present invention addresses a problem of providing an MgB2 wire material having a small reversible bending radius, a superconducting coil using the same, and an MRI without lowering a critical current value and a critical current density of the MgB2 wire material to an extreme. To solve the problem, provided are a superconducting wire having a plurality of MgB2 strands and a first base metal, a superconducting coil using the same, and an MRI, the superconducting wire being characterized in that in a cross section orthogonal to a wire longitudinal direction, a center point of an area surrounded by the plurality of MgB2 strands and a center axis of a cross section of the superconducting wire are disposed in separated positions.

In various embodiments, superconducting wires incorporate diffusion barriers composed of Nb alloys or Nb—Ta alloys that resist internal diffusion and provide superior mechanical strength to the wires.

A monofilament (100) for producing an Nb.sub.3Sn-containing superconductor wire (33) includes a powder core (1) with an Sn-containing powder, a reaction tube (3) composed of an Nb alloy that includes Nb and at least one further alloy component X. The powder core is disposed within the reaction tube. The monofilament also includes at least one source (4) for at least one partner component Pk. A respective source includes one or more source structures at a unitary radial position in the monofilament. The alloy component X and the partner component Pk form precipitates XPk on reaction annealing of the monofilament in which Sn from the powder core and Nb from the reaction tube react to produce Nb.sub.3Sn. The powder core is disposed in a moderation tube, which in turn is disposed within the reaction tube. This provides a monofilament for a powder-in-tube based Nb.sub.3Sn-containing superconductor wire with improved current carrying capacity.

In various embodiments, superconducting wires incorporate diffusion barriers composed of Nb alloys or Nb—Ta alloys that resist internal diffusion and provide superior mechanical strength to the wires.

A method comprises disposing one or more continuous fibers, wherein the one or more continuous fibers are at least partially embedded in high temperature superconducting component powders. The fiber of the one or more continuous fibers comprises a curved fiber that comprises a hoop or a spiral. The method further comprises heating the high temperature superconducting component powders and the one or more continuous fibers and cooling the high temperature superconducting component powders and the one or more continuous fibers. The cooling generates a high temperature superconducting material.

A NbTi superconducting multicore wire includes a core portion and a first barrier layer arranged around the core portion and composed of a first copper alloy including at least one element selected from Ni or Mn. A filament assembly arranged around the first barrier layer includes NbTi filament assemblies each including at least seven NbTi filaments, embedded in a matrix of a second copper alloy including at least one element selected from Ni or Mn. A second barrier layer is arranged around the filament assembly and composed of the first copper alloy, and a stabilizing layer arranged around the second barrier layer and composed of metal. The NbTi filaments are arranged in circular shapes each having a different diameter, centering on one NbTi filament, and NbTi filaments arranged in a circular shape in an outermost circle being arranged at approximately equal intervals along a circumferential direction.