Evidence from EXAFS for Different Ta/Ti Site Occupancy in High Critical Current Density Nb$_{3}$Sn Superconductor Wires

Heald, Steve M.; Tarantini, Chiara; Lee, Peter J.; Brown, Michael D.; Sung, ZuHawn; Ghosh, Arup K.; Larbalestier, David C.

doi:10.1038/s41598-018-22924-3

Evidence from EXAFS for Different Ta/Ti Site Occupancy in High Critical Current Density Nb $_{3}$ Sn Superconductor Wires

Steve M. Heald
(
- ANL, APS
)
,
Chiara Tarantini
(
- Natl. High Mag. Field Lab.
)
,
Peter J. Lee
(
- Natl. High Mag. Field Lab.
)
,
Michael D. Brown
(
- Natl. High Mag. Field Lab.
)
,
ZuHawn Sung
(
- Natl. High Mag. Field Lab.
)

Mar 19, 2018

14 pages

Published in:

Sci.Rep. 8 (2018) 1, 4798

Published: Mar 19, 2018

e-Print:

1803.07025 [cond-mat.supr-con]

DOI:

10.1038/s41598-018-22924-3

View in:

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Abstract: (Springer)

To meet critical current density, J

_{c}

, targets for the Future Circular Collider (FCC), the planned replacement for the Large Hadron Collider (LHC), the high field performance of Nb

_{3}

Sn must be improved, but champion J

_{c}

values have remained static for the last 10 years. Making the A15 phase stoichiometric and enhancing the upper critical field H

_{c2}

by Ti or Ta dopants are the standard strategies for enhancing high field performance but detailed recent studies show that even the best modern wires have broad composition ranges. To assess whether further improvement might be possible, we employed Extended X-ray Absorption Fine Structure (EXAFS) to determine the lattice site location of dopants in modern high-performance Nb

_{3}

Sn strands with J

_{c}

values amongst the best so far achieved. Although Ti and Ta primarily occupy the Nb sites in the A15 structure, we also find significant Ta occupancy on the Sn site. These findings indicate that the best performing Ti-doped stand is strongly sub-stoichiometric in Sn and that antisite disorder likely explains its high average H

_{c2}

behavior. These new results suggest an important role for dopant and antisite disorder in minimizing superconducting property distributions and maximizing high field J

_{c}

properties.

Note:

14 pages, 6 figures

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Evidence from EXAFS for Different Ta/Ti Site Occupancy in High Critical Current Density Nb3_{3}3​Sn Superconductor Wires

Citations per year

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The 16 T Dipole Development Program for FCC

bulk

Temperature and Purity Dependence of the Superconducting Critical Field, Hc-2. 3. Electron Spin and Spin-Orbit Effects

Evidence from EXAFS for Different Ta/Ti Site Occupancy in High Critical Current Density Nb $_{3}$ Sn Superconductor Wires

Performance of the First Short Model 150-mm-Aperture Nb $_3$ Sn Quadrupole MQXFS for the High-Luminosity LHC Upgrade