The present disclosure relates to a superconductor including magnesium diboride and a production method therefor. A superconductor having a high critical current density at a certain temperature and under a certain magnetic field may be obtained by doping magnesium diboride with liquid chloroform during the production of the superconductor.

An object of the invention is to provide: an MgB.sub.2 superconducting thin-film wire that exhibits excellent J.sub.c characteristics even under a 20 K magnetic field; and a method for producing thereof. The MgB.sub.2 superconducting thin-film wire includes a long substrate and an MgB.sub.2 thin film formed on the long substrate. The MgB.sub.2 thin film has a microtexture such that MgB.sub.2 columnar crystal grains stand densely together on the surface of the long substrate, and has T.sub.c of 30 K or higher. In grain boundary regions of the MgB.sub.2 columnar crystal grains, a predetermined transition metal element is dispersed and segregated. The predetermined transition metal element is an element having a body-centered cubic lattice structure.

Methods and structures corresponding to superconducting apparatus including superconducting layers and traces are provided. A method for forming a superconducting apparatus includes forming a first dielectric layer on a substrate by depositing a first dielectric material on the substrate and curing the first dielectric material at a first temperature. The method further includes forming a first superconducting layer comprising a first set of patterned superconducting traces on the first dielectric layer. The method further includes forming a second dielectric layer on the first superconducting layer by depositing a second dielectric material on the first superconducting layer and curing the second dielectric material at a second temperature, where the second temperature is lower than the first temperature. The method further includes forming a second superconducting layer comprising a second set of patterned superconducting traces on the second dielectric layer.

The present invention addresses the problem of providing a wire material capable of ensuring high critical current density, regardless of the cross-sectional shape thereof. This super-conducting wire material is equipped with an MgB.sub.2 filament, the number density of cavities having a major axis of 10 m or higher in a longitudinal cross-section of the superconducting wire material is in the range of 5-500 mm.sup.2, and the average value of the angle formed between the major axis of the cavities and the axis of the wire material is 60 degrees or more.

There is provided a headset having at least one microphone for detecting ambient noises, at least one electroacoustic reproduction transducer and a control unit for controlling the headset. The headset also has a digital active noise reduction unit for performing digital active noise reduction based on the ambient noises recorded by the microphone. The headset further has a data interface for receiving data and/or parameters for the headset and for outputting data and/or parameters stored in the headset.

An MgB.sub.2 superconducting wire includes a core containing MgB.sub.2 and a metal sheath which surrounds the core. The core includes at least a first MgB.sub.2 core positioned on the center side, and a second MgB.sub.2 core positioned outside the first MgB.sub.2 core, and the density of the second MgB.sub.2 core is lower than the density of the first MgB.sub.2 core.

An MgB.sub.2-based superconducting wire for a liquid hydrogen fluid level sensor which can maintain an unimmersed portion of the MgB.sub.2-based superconducting wire for a liquid hydrogen fluid level sensor in a non-superconducting state even without heating the unimmersed portion is provided. A wire for a liquid hydrogen fluid level sensor comprises an MgB.sub.2-based superconductor which contains Mg, B, and Al. The critical temperature at which the electrical resistance becomes essentially zero is 20-25 K, and the transition width, which is the difference between the temperature at which the electrical resistance begins to decrease toward zero and the critical temperature, is at most 5 K.

There is provided a method of manufacturing a continuous wire comprising forming a strip formed from at least one metallic material into a channel, placing at least one powder into the channel and sealing edges of the channel together to produce a wire, wherein the method further comprises mixing the powder with a carrier liquid to create a slurry and placing the slurry into the channel. The carrier liquid is chemically inert with respect to the at least one powder.

A method of manufacturing a superconducting tape includes forming a slurry of superconducting material, forming a slurry of sacrificial material, extruding the slurries of superconducting and sacrificial materials as interdigitated stripes onto a substrate, and removing the sacrificial material to form superconducting filaments.

A method for restoring superconductivity of a wire having a core of reacted MgB.sub.2 comprises subjecting said wire to a two-phase heat treatment, wherein a first phase comprises heating in a range of 800? C. to 1000? C. during 20 minutes to 40 minutes and a second phase comprises heating in a range of 550? C. to 750? C. during 45 minutes to 75 minutes.