Oxide superconductor and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-10692634-B2
Application number	US-201715446561-A
Country	US
Kind code	B2
Filing date	Mar 1, 2017
Priority date	Aug 23, 2016
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

An oxide superconductor of an embodiment includes an oxide superconductor layer having a continuous Perovskite structure including rare earth elements, barium (Ba), and copper (Cu). The rare earth elements include a first element which is praseodymium, at least one second element selected from the group consisting of neodymium, samarium, europium, and gadolinium, at least one third element selected from the group consisting of yttrium, terbium, dysprosium, and holmium, and at least one fourth element selected from the group consisting of erbium, thulium, ytterbium, and lutetium. When the number of atoms of the first element is N(PA), the number of atoms of the second element is N(SA), and the number of atoms of the fourth element is N(CA), 1.5×(N(PA)+N(SA))≤N(CA) or 2×(N(CA)−N(PA))≤N(SA) is satisfied.

First claim

What is claimed is:

1. An oxide superconductor, comprising:
an oxide superconductor layer having a continuous Perovskite structure including rare earth elements, barium (Ba), and copper (Cu),
wherein:
the rare earth elements include a first element, at least one second element, at least one third element, and at least one fourth element,
the first element is praseodymium (Pr),
the at least one second element is selected from the group consisting of neodymium (Nd), samarium (Sm), europium (Eu), and gadolinium (Gd),
the at least one third element is selected from the group consisting of yttrium (Y), terbium (Tb), dysprosium (Dy), and holmium (Ho),
the at least one fourth element is selected from the group consisting of erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu), and
when the number of atoms of the first element is N(PA), the number of atoms of the at least one second element is N(SA), and the number of atoms of the at least one fourth element is N(CA), 1.5×(N(PA)+N(SA))≤N(CA) or 2×(N(CA)−N(PA))≤N(SA) is satisfied.

2. The oxide superconductor according to claim 1 , wherein:
1.5×(N(PA)+N(SA))≤N(CA) is satisfied,
the at least one second element is selected from the group consisting of neodymium (Nd) and samarium (Sm),
the at least one third element is selected from the group consisting of yttrium (Y), dysprosium (Dy), and holmium (Ho), and
the at least one fourth element is selected from the group consisting of erbium (Er), thulium (Tm), and ytterbium (Yb).

3. The oxide superconductor according to claim 1 , wherein:
1.5×(N(PA)+N(SA))≤N(CA) is satisfied,
the at least one second element is samarium (Sm),
the at least one third element is selected from the group consisting of yttrium (Y) and holmium (Ho), and
the at least one fourth element is selected from the group consisting of erbium (Er) and thulium (Tm).

4. The oxide superconductor according to claim 1 , wherein the oxide superconductor layer includes fluorine (F) of 2.0×10 15 is atoms/cc or more and 5.0×10 19 atoms/cc or less and carbon (C) of 1.0×10 17 atoms/cc or more and 5.0×10 20 atoms/cc or less.

5. The oxide superconductor according to claim 1 , wherein, when the number of atoms of the rare earth elements is N(RE), and the number of atoms of the at least one third element is N(MA), N(MA)/N(RE)≥0.6 is satisfied.

6. The oxide superconductor according to claim 1 , wherein, when the number of atoms of the rare earth elements is N(RE), and the number of atoms of the first element is N(PA), 0.00000001≤N(PA)/N(RE) is satisfied.

7. The oxide superconductor according to claim 1 , wherein, when the number of atoms of the first element is N(PA), the number of atoms of the at least one second element is N(SA), and the number of atoms of the at least one fourth element is N(CA), 4×(N(PA)+N(SA))≤N(CA) is satisfied.

8. The oxide superconductor according to claim 1 , further comprising:
a substrate; and
a metal layer,
wherein the oxide superconductor layer is disposed between the substrate and the metal layer.

9. The oxide superconductor according to claim 1 , wherein the continuous Perovskite structure has a size of 500 nm×100 nm or more in a cross section of the oxide superconductor layer in a layer thickness direction thereof.

10. An oxide superconductor, comprising:
an oxide superconductor layer having a continuous Perovskite structure including rare earth elements, barium (Ba), and copper (Cu),
wherein:
the rare earth elements include a first element, at least one second element, at least one third element, and at least one fourth element,
the first element is praseodymium (Pr),
the at least one second element is selected from the group consisting of neodymium (Nd), samarium (Sm), europium (Eu), and gadolinium (Gd),
the at least one third element is selected from the group consisting of yttrium (Y), terbium (Tb), dysprosium (Dy), and holmium (Ho),
the at least one fourth element is selected from the group consisting of erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu), and
at least one of the at least one second element and the at least one fourth element includes two or more elements.

11. The oxide superconductor according to claim 10 , wherein:
the at least one second element is selected from the group consisting of neodymium (Nd) and samarium (Sm),
the at least one third element is selected from the group consisting of yttrium (Y), dysprosium (Dy), and holmium (Ho), and
the at least one fourth element includes two or more elements selected from the group consisting of erbium (Er), thulium (Tm), and ytterbium (Yb).

12. The oxide superconductor according to claim 10 , wherein:
the at least one second element is samarium (Sm),
the at least one third element is selected from the group consisting of yttrium (Y) and holmium (Ho), and
the at least one fourth element is erbium (Er) and thulium (Tm).

13. The oxide superconductor according to claim 10 , wherein the oxide superconductor layer includes fluorine (F) of 2.0×10 15 atoms/cc or more and 5.0×10 19 atoms/cc or less and carbon (C) of 1.0×10 17 atoms/cc or more and 5.0×10 20 atoms/cc or less.

14. The oxide superconductor according to claim 10 , wherein, when the number of atoms of the rare earth elements is N(RE), and the number of atoms of the at least one third element is N(MA), N(MA)/N(RE)≥0.6 is satisfied.

15. The oxide superconductor according to claim 10 , wherein, when the number of atoms of the rare earth elements is N(RE), and the number of atoms of the first element is N(PA), 0.00000001≤N(PA)/N(RE) is satisfied.

16. The oxide superconductor according to claim 10 , further comprising:
a substrate; and
a metal layer,
wherein the oxide superconductor layer is disposed between the substrate and the metal layer.

17. An oxide superconductor, comprising an oxide superconductor layer having a continuous Perovskite structure including rare earth elements, barium (Ba), and copper (Cu),
wherein:
the rare earth elements include a first element, at least one second element, and at least one third element,
the first element is praseodymium (Pr),
the at least one second element is selected from the group consisting of gadolinium (Gd), yttrium (Y), terbium (Tb), dysprosium (Dy), and holmium (Ho),
the at least one third element is selected from the group consisting of erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu), and
when the number of atoms of the first element is N(PA), and the number of atoms of the at least one third element is N(CA), 1.5×N(PA)≤N(CA) is satisfied.

18. The oxide superconductor according to claim 17 , wherein the oxide superconductor layer includes fluorine (F) of 2.0×10 15 atoms/cc or more and 5.0×10 19 atoms/cc or less and carbon (C) of 1.0×10 17 atoms/cc or more and 5.0×10 20 atoms/cc or less.

19. An oxide superconductor, comprising:
an oxide superconductor layer having a continuous Perovskite structure including rare earth elements, barium (Ba), and copper (Cu),
wherein:
the rare earth elements include a first element, at least one second element, and at least two third elements,
the first element is praseodymium (Pr),
the at least one second element is selected from the group consisting of gadolinium (Gd), yttrium (Y), terbium (Tb), dysprosium (Dy), and holmium (Ho), and
the at least two third elements is selected from the group consisting of erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu).

20. The oxide superconductor according to claim 19 , wherein the oxide sup

Assignees

• Toshiba Kk

Inventors

• Araki Takeshi
• Ishii Hirotaka
• Kobayashi Nao

Classifications

• C04B35/62222 Primary

  obtaining ceramic coatings (coating of mortars, concrete, artificial or natural stone or ceramics C04B41/45; laminated ceramic products B32B18/00; coating of glass C03C17/00, applying ceramic coatings on silicon for semi-conductor purposes H10W; coating metallic materials C23) · CPC title

• C04B2235/6584

  at an oxygen percentage below that of air · CPC title

• C04B2235/6585

  at an oxygen percentage above that of air · CPC title

• C04B2235/81

  Materials characterised by the absence of phases other than the main phase, i.e. single phase materials · CPC title

• C04B2235/663

  Oxidative annealing · CPC title