Patent ID: 8880135

Claim:
A low AC loss oxide superconductor comprising an oxide superconducting layer on a base material, wherein said oxide superconducting layer is separated into a plurality of filament conductors in parallel to the lengthwise direction of said base material by dividing grooves which are plurally formed in the widthwise direction of said base material, wherein a high-resistance oxide having an electrical resistivity of 44 Ωcm or more is formed in said dividing grooves, electrical resistance between adjacent filament conductors via said dividing grooves increases due to said high-resistance oxide formed in said dividing grooves and low AC loss is realized, said high-resistance oxide is an oxide of molten coagulation which adhered to the inside of said dividing grooves, and the diving grooves are arranged at an angle greater than or equal to 25° and less than or equal to 45° relative to the normal line of the base material when viewed from front.