Oxide superconductor and method for manufacturing same
地域：
Tokyo
摘要
An oxide superconductor of an embodiment includes an oxide superconducting layer including a first superconducting region containing barium, copper, and a first rare earth element, having a continuous perovskite structure, and extending in a first direction, a second superconducting region containing barium, copper, and a second rare earth element, having a continuous perovskite structure, and extending in the first direction, and a non-superconducting region disposed between the first and the second superconducting region, containing praseodymium, barium, copper, and a third rare earth element, a ratio of the number of atoms of the praseodymium to a sum of the number of atoms of the third rare earth element and the number of atoms of the praseodymium which is 20% or more, having a continuous perovskite structure continuous with the perovskite structure of the first superconducting region and the perovskite structure of the second superconducting region, and extending in the first direction.
說(shuō)明書(shū)
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This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2020-154921, filed on Sep. 15, 2020, the entire contents of which are incorporated herein by reference.
Embodiments described herein relate generally to an oxide superconductor and a method for manufacturing the same.
Superconductivity is a phenomenon in which a resistance value becomes completely zero, which is discovered by using mercury by Kamerring Onnes of the Netherlands who developed a refrigerator. Thereafter, according to the Bardeen Cooper Schrieffer (BCS) theory, an upper limit of a superconducting transition temperature (Tc) is set to 39 K, which is Tc of a first-class superconductor, and is around 39 K at normal pressure.
A copper-based oxide superconductor discovered by Bednorz et al. In 1986 showed results exceeding 39 K, leading to the development of an oxide superconductor that can be used at liquid nitrogen temperature. The oxide superconductor is a second-class superconductor in which superconducting and non-superconducting states are mixed. Today, many high-temperature oxide superconductors that can be used at the liquid nitrogen temperature are sold in a lot having a length of 500 m or more. A superconducting wire is expected to be applied to various large-scale equipment such as a superconducting power transmission cable, a nuclear fusion reactor, a magnetically levitated train, an accelerator, and magnetic resonance imaging (MRI).
權(quán)利要求
What is claimed is:1. An oxide superconductor, comprising:an oxide superconducting layer including a first 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 first superconducting region having a continuous perovskite structure, and the first superconducting region extending in a first direction, a second superconducting region containing 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), the second superconducting region having a continuous perovskite structure, and the second superconducting region extending in the first direction, and a non-superconducting region disposed between the first superconducting region and the second superconducting region, the non-superconducting region being in contact with the first superconducting region and the second superconducting region, the non-superconducting region containing praseodymium (Pr), barium (Ba), copper (Cu), and at least one third 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 third 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 first superconducting region and the continuous perovskite structure of the second superconducting region, and the non-superconducting region extending in the first direction. 2. The oxide superconductor according to claim 1 , wherein the non-superconducting region has a size of 100 nm×100 nm×100 nm or more. 3. The oxide superconductor according to claim 1 , wherein a length of the non-superconducting region in the first direction is equal to or more than 1 μm. 4. The oxide superconductor according to claim 1 , wherein a width of the non-superconducting region in a second direction perpendicular to the first direction and from the non-superconducting region toward the first superconducting region is smaller than a width of the first superconducting region in the second direction. 5. The oxide superconductor according to claim 4 , wherein a length of the non-superconducting region in the first direction is equal to or more than 1 m, and the width of the non-superconducting region in the second direction is equal to or less than 80 μm. 6. The oxide superconductor according to claim 4 , wherein a length of the non-superconducting region in the first direction is equal to or more than 1 m, and the width of the non-superconducting region in the second direction is equal to or less than 10 μm. 7. The oxide superconductor according to claim 1 , wherein the a/b-axis orientation ratio in a portion of 100 μm or less from a boundary between the first superconducting region and the non-superconducting region to a side of the first superconducting region is less than 30%. 8. The oxide superconductor according to claim 1 , wherein the oxide superconducting layer contains fluorine (F) of equal to or more than 2.0×1015 atoms/cm3 and equal to or less than 5.0×1019 atoms/cm3, and carbon (C) of equal to or more than 1.0×1017 atoms/cm3 and equal to or less than 5.0×1020 atoms/cm3. 9. The oxide superconductor according to claim 1 , wherein the at least one first rare earth element, the at least one second rare earth element, and the at least one third rare earth element are the same. 10. The oxide superconductor according to claim 1 , wherein the first superconducting region contains praseodymium (Pr), and a ratio of a number of atoms of the praseodymium (Pr) to a sum of a number of atoms of the at least one first rare earth element and the number of atoms of the praseodymium (Pr) the first superconducting region (31a) is equal to or less than 15%. 11. The oxide superconductor according to claim 1 , further comprising:a substrate; and a metal layer, wherein the oxide superconducting layer is disposed between the substrate and the metal layer.
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