Superconductor Article with Directional Flux Pinning
A method and composition for doped HTS tapes having directional flux pinning and critical current.
1 . A superconducting tape structure comprising:
a substrate;
an overlying buffer; and
a superconductor, wherein the superconductor has a critical current retention factor greater than about 90% when a magnetic field of about 0.1 T is applied about parallel to the tape.
2 . The superconducting tape of claim 1 wherein the superconductor comprises at least one rare-earth metal chosen from the group consisting of Gd, Y, Sm, Nd, Eu, Dy, Ho, Er and Yb.
3 . The superconducting tape of claim 2 , wherein the superconductor comprises a ratio of at least 1.5 total rare-earth metals to at least 3 copper.
4 . The superconducting tape of claim 3 , wherein the rare-earth metals content comprises a combination of Sm and Y.
5 . The superconducting tape of claim 3 , wherein the rare-earth metals content comprises a combination of Gd and Y.
6 . The superconducting tape of claim 5 , further comprising a ratio of Gd to Y of about 1:1.
7 . The superconducting tape of claim 2 , comprising at least one dopant selected from the group consisting of Zr, Ta, Hf, Sn, Nb, Ti and Ce.
8 . The superconducting tape of claim 7 , wherein the superconductor comprises a dopant to copper ratio of at least about 0.05 dopant to at least about 3 copper.
9 . The superconducting tape of claim 7 , wherein the dopant comprises Zr.
10 . The superconducting tape of claim 1 , wherein the superconductor is a conductor formed by metal organic chemical vapor deposition fabrication.
11 . The superconducting tape of claim 1 , wherein the superconducting tape comprises a critical current retention factor greater than about 50% when a magnetic field of about 0.5 T is applied about parallel to the superconductor.
12 . The superconducting tape of claim 1 , wherein the superconducting tape comprises a critical current retention factor greater than about 30% when a magnetic field of about 1 T is applied about parallel to the superconducting tape.
13 . The superconducting tape of claim 12 , wherein the superconducting tape comprises a critical current retention factor greater than about 15% when a magnetic field of about 1 T is applied about perpendicular to the tape.
14 . A superconductor structure comprising:
a substrate;
an overlying buffer; and
a superconductor, wherein the superconductor has a critical current retention factor greater than about 50% when a magnetic field of about 0.5 T is applied about parallel to the superconductor.
15 . The superconductor structure of claim 14 , wherein the superconductor comprises at least one rare-earth metal chosen from the group consisting of Gd, Y, Sm, Nd, Eu, Dy, Ho, Er and Yb;
and wherein the superconductor comprises a ratio of total rare-earth metals content to copper content of at least 1.5 total rare-earth metals to at least 3 copper.
16 . The superconductor structure of claim 15 , wherein the rare-earth metals content comprises of a combination of Sm and Y or Gd and Y.
17 . The superconductor structure of claim 16 , wherein the ratio Gd and Y comprises a ratio of about 1 Gd to about 1Y.
18 . The superconductor structure of claim 14 , wherein the superconductor comprises at least one dopant selected from the group consisting of Zr, Ta, Hf, Sn, Nb, Ti and Ce; and wherein the dopant content to copper content ratio comprises at least about 0.05 dopant to at least about 3 copper.
19 . The superconductor structure of claim 18 , wherein the dopant comprises Zr.
20 . The superconductor structure of claim 14 , wherein the superconductor comprises a critical current retention factor greater than about 30% when a magnetic field of about 1 T is applied about parallel to the superconducting tape.
21 . The superconductor structure of claim 20 , wherein the superconductor comprises a critical current retention factor greater than about 15% when a magnetic field of about 1 T is applied about perpendicular to the tape.