Superconductor with improved flux pinning at low temperatures
A REBCO superconductor tape that can achieve a lift factor greater than or equal to approximately 3.0 or 4.0 in an approximately 3 T magnetic field applied perpendicular to a REBCO tape at approximately 30 K. In an embodiment, the REBCO superconductor tape can include a critical current density less than or equal to approximately 4.2 MA/cm 2 at 77 K in the absence of an external magnetic field. In another embodiment, the REBCO superconductor tape can include a critical current density greater than or equal to approximately 12 MA/cm 2 at approximately 30 K in a magnetic field of approximately 3 T having an orientation parallel to a c-axis.
1. A superconductor tape comprising:
a lift factor greater than or equal to approximately 3.0 at approximately 30 K in a magnetic field of approximately 3 T having an orientation perpendicular to the tape.
2. The superconductor tape of claim 1 , further comprising a barium+dopant content greater than approximately 32.0 atomic %.
3. The superconductor tape of claim 2 , further comprising a copper content less than approximately 48.5 atomic % and a rare-earth content between 16.5-19.5 atomic %.
4. The superconductor tape of claim 2 , wherein the dopant content is at least approximately 1.65 atomic % and the barium content is at least approximately 29.9 atomic %.
5. The superconductor tape of claim 1 , wherein the lift factor is greater than or equal to approximately 4.0 at approximately 30 K in a magnetic field of approximately 3 T having an orientation perpendicular to the tape.
6. The superconductor tape of claim 5 , further comprising a barium+dopant content greater than approximately 33.0 atomic % and a rare-earth content between 16.5-19.5 atomic %.
7. The superconductor tape of claim 6 , further comprising a copper content less than approximately 49.0 atomic %.
8. The superconductor tape of claim 6 , wherein the dopant content is at least approximately 1.65 atomic % and the barium content is at least approximately 30.5 atomic %.
9. The superconductor tape of claim 5 , further comprising a barium to barium+dopant+copper ratio greater than approximately 38.0%, a dopant to barium+dopant+copper ratio less than approximately 2.5%, a copper to barium+dopant+copper ratio less than approximately 59.5%, and a rare-earth content between 16.5-19.5 atomic %.
10. The superconductor tape of claim 5 , further comprising a barium to copper ratio greater than or equal to approximately 0.62 and a rare-earth content between 16.5-19.5 atomic %.
11. The superconductor tape of claim 5 , further comprising a barium+dopant to copper ratio greater than or equal to approximately 0.65 and a rare-earth content between 16.5-19.5 atomic %.
12. The superconductor tape of claim 5 , further comprising a critical current density less than or equal to approximately 3.8 MA/cm 2 at 77 K in absence of an external magnetic field.
13. The superconductor tape of claim 1 , further comprising a barium to barium+dopant+copper ratio greater than approximately 37.5%, a dopant to barium+dopant+copper ratio less than approximately 2.0%, a copper to barium+dopant+copper ratio less than approximately 60.5%, and a rare-earth content between 16.5-19.5 atomic %.
14. The superconductor tape of claim 1 , further comprising a barium to copper ratio greater than or equal to approximately 0.58 and a rare-earth content between 16.5-19.5 atomic %.
15. The superconductor tape of claim 1 , further comprising a barium+dopant to copper ratio greater than or equal to approximately 0.62 and a rare-earth content between 16.5-19.5 atomic %.
16. The superconductor tape of claim 1 , further comprising a critical current density less than or equal to approximately 4.2 MA/cm 2 at 77 K in absence of an external magnetic field.
17. The superconductor tape of claim 1 , wherein the tape further comprises a critical current greater than 800 A/cm-width in the 3 T magnetic field at 30K.
18. A superconductor tape comprising:
a critical current density greater than approximately 12 MA/cm 2 at approximately 30 K in a magnetic field of approximately 3 T having an orientation parallel to the c-axis.
19. The superconductor tape of claim 18 , wherein the critical current density is greater than approximately 15 MA/cm 2 at approximately 30 K in a magnetic field of approximately 3 T having an orientation parallel to the c-axis.
20. The superconductor tape of claim 18 , wherein the superconductor tape comprises a superconductor film having a film thickness of at least approximately 0.9 μm.
21. The superconductor tape of claim 18 , wherein the tape further comprises a critical current greater than 800 A/cm-width in the 3 T magnetic field at 30K.