Oxide superconductor and method for manufacturing same

An oxide superconductor, comprising:

• an oxide superconducting layer including
• at least one superconducting region containing barium (Ba), copper (Cu), and at least one first rare earth element selected from the group consisting of yttrium (Y), lanthanum (La), neodymium (Nd), samarium (Sm), europium (Eu), gadolinium (Gd), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu), the at least one superconducting region having a continuous perovskite structure, and the at least one superconducting region having a size of 100 nm×100 nm×100 nm or more, and
• a non-superconducting region in contact with the at least one superconducting region, the non-superconducting region containing praseodymium (Pr), barium (Ba), copper (Cu), and at least one second rare earth element selected from the group consisting of yttrium (Y), lanthanum (La), neodymium (Nd), samarium (Sm), europium (Eu), gadolinium (Gd), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu), a ratio of a number of atoms of the praseodymium (Pr) to a sum of a number of atoms of the at least one second rare earth element and the number of atoms of the praseodymium (Pr) in the non-superconducting region being equal to or more than 20%, the non-superconducting region having a continuous perovskite structure continuous with the continuous perovskite structure of the at least one superconducting region, and the non-superconducting region having a size of 100 nm×100 nm×100 nm or more.