Superconductor Article with Directional Flux Pinning

Patent metadata

Field	Value
Publication number	US-2017194078-A1
Application number	US-201615384486-A
Country	US
Kind code	A1
Filing date	Dec 20, 2016
Priority date	Jun 12, 2012
Publication date	Jul 6, 2017
Grant date	—

Abstract

A method and composition for doped HTS tapes having directional flux pinning and critical current.

First claim

What is claimed:

1 . A method of using a superconducting tape, comprising:
applying a magnetic field parallel to a surface of a superconducting tape, wherein the magnetic field is applied at about 0.1 T and the superconducting tape comprises a plurality of nanocolumns oriented perpendicular to the surface of the superconducting tape; generating, in response to the applying the magnetic field, a critical current; removing the magnetic field; and retaining, subsequent to the removing of the magnetic field, at least 90% of the critical current.

2 . The method of claim 1 , wherein the superconducting tape comprises copper and a rare-earth metals content of at least two of Gd, Y, Sm, Nd, Eu, Dy, Ho, Er or Yb.

3 . The method of claim 2 , wherein the superconducting tape comprises a ratio of total rare earth metals content to copper of at least 1.5:3.

4 . The method claim 3 , wherein the rare-earth metals content comprises Sm and Y.

5 . The method of claim 3 , wherein the rare-earth metals content comprises Gd and Y.

6 . The method of claim 5 , further comprising a ratio of Gd to Y of about 1:1.

7 . The method of claim 2 , further comprising an at least one dopant comprising Ta, Hf, Sn, Nb, Ti or Ce.

8 . The method of claim 7 , wherein the superconducting tape further comprises a dopant to copper ratio of at least about 0.05 dopant to at least about 3 copper.

9 . The method of claim 7 , wherein the dopant comprises Zr.

10 . The method claim 1 , further comprising fabricating a portion of the superconducting tape by metal organic chemical vapor deposition (MOCVD).

11 . A method using a superconducting tape, comprising:
applying a magnetic field parallel to a surface of a superconducting tape, wherein the magnetic field is applied at about 0.5 T and the superconducting tape comprises a buffer disposed on a substrate, a superconductor disposed on the buffer, and a plurality of nanocolumns oriented perpendicular to the surface of the superconducting tape; generating, in response to the applying the magnetic field, a first critical current; removing the magnetic field; and removing the magnetic field; and retaining, subsequent to the removing of the magnetic field, at least 50% of the critical current.

12 . The method of claim 11 , wherein the superconductor comprises copper and a rare-earth metal content of at least two of Gd, Y, Sm, Nd, Eu, Dy, Ho, Er or Yb, and wherein the superconductor comprises a ratio of the total rare-earth metals content to copper content of at least 1.5: 3.

13 . The method of claim 12 , wherein the rare-earth metals content comprises Y and one of Sm or Gd.

14 . The method of claim 13 , wherein the ratio Y to Sm or Gd comprises a ratio of about 1:1.

15 . The method of claim 14 , wherein the superconductor comprises copper and at least one dopant comprising Zr, Ta, Hf, Sn, Nb, Ti or Ce, and wherein the dopant content to copper content ratio comprises at least about 0.05 dopant to at least about 3 copper.

16 . A method of using superconducting tape, comprising:
applying a magnetic field parallel to a surface of a superconducting tape comprising a plurality of nanocolumns oriented perpendicular to the surface, wherein the magnetic field is applied at about 1 T; generating, in response to the applying the magnetic field, a first critical current; removing the magnetic field; and retaining, subsequent to the removing of the magnetic field, at least 30% of the critical current.

17 . The method of claim 16 , further retaining, subsequent to the removing of the magnetic field, at least 15% of the critical current.

18 . The method of claim 16 , wherein the superconducting tape comprises copper and a rare-earth metal content of at least two of Gd, Y, Sm, Nd, Eu, Dy, Ho, Er or Yb, and wherein the superconductor comprises a ratio of the total rare-earth metals content to copper content of at least 1.5: 3.

19 . The method of claim 18 , wherein the rare-earth metals content comprises Y and one of Sm or Gd.

20 . The method of claim 16 , wherein the superconducting tape comprises copper and at least one dopant comprising Zr, Ta, Hf, Sn, Nb, Ti or Ce, and wherein the dopant content to copper content ratio comprises at least about 0.05 dopant to at least about 3 copper.

Assignees

• Univ Houston System
• Superpower Inc

Inventors

• Selvamanickam Venkat
• Chen Yimin

Classifications

• H01B1/026 Primary

  Alloys based on copper · CPC title

• H01B12/02 Primary

  characterised by their form · CPC title

• H01B9/006

  Constructional features relating to the conductors · CPC title

• Y02E40/60

  Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment · CPC title

• H10N60/0828

  Introducing flux pinning centres · CPC title