Significant enhancement of compositional and superconducting homogeneity in Ti rather than Ta-doped Nb3Sn

Tarantini, C.; Sung, Z. -H.; Lee, P. J.; Ghosh, A. K.; Larbalestier, D. C.

doi:10.1063/1.4940726

Title: Significant enhancement of compositional and superconducting homogeneity in Ti rather than Ta-doped Nb₃Sn

Journal Article · Mon Jan 25 00:00:00 EST 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4940726· OSTI ID:1235920

Tarantini, C. ^[1]; Sung, Z. -H. ^[1]; Lee, P. J. ^[1]; Ghosh, A. K. ^[2]; Larbalestier, D. C. ^[1]

Florida State Univ., Tallahassee, FL (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Nb₃Sn wires are now very close to their final optimization but despite its classical nature, detailed understanding of the role of Ta and Ti doping in the A15 is not fully understood. Long thought to be essentially equivalent in their influence on H_c2, they were interchangeably applied. Here we show that Ti produces significantly more homogeneous chemical and superconducting properties. Despite Ta-doped samples having a slightly higher T_c onset in zero-field, they always have a wider Tc-distribution. In particular, whereas the Ta-doped A15 has a T_c-distribution extending from 18 down to 5-6 K (the lowest expected Tc for the binary A15 phase), the Ti-doped samples have no A15 phase with T_c below ~12 K. The much narrower T_c distribution in the Ti-doped samples has a positive effect on their in-field T_c-distribution too, leading to an extrapolated _μ0H_c2(0) 2 Tesla larger than the Ta-doped one. Ti-doping also appears to be very homogeneous even when the Sn content is reduced in order to inhibit breakdown of the diffusion barriers in very high J_c conductors. As a result, the enhanced homogeneity of the Ti-doped samples appears to result from its assistance of rapid diffusion of Sn into the filaments and by its incorporation into the A15 phase interchangeably with Sn on the Sn sites of the A15 phase.

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Research Organization:: Florida State Univ., Tallahassee, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: National Science Foundation, Arlington, VA (United States). National High Magnetic Field Laboratory

Grant/Contract Number:: SC0012083; AC02-98CH10886; FG02-07ER41451

OSTI ID:: 1235920

Alternate ID(s):: OSTI ID: 1235799

Journal Information:: Applied Physics Letters, Vol. 108, Issue 4; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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Evidence from EXAFS for Different Ta/Ti Site Occupancy in High Critical Current Density Nb3Sn Superconductor Wires Heald, Steve M.; Tarantini, Chiara; Lee, Peter J. Scientific Reports, Vol. 8, Issue 1 https://doi.org/10.1038/s41598-018-22924-3	journal	March 2018
Precipitous change of the irreversible strain limit with heat-treatment temperature in Nb3Sn wires made by the restacked-rod process Cheggour, Najib; Stauffer, Theodore C.; Starch, William Scientific Reports, Vol. 8, Issue 1 https://doi.org/10.1038/s41598-018-30911-x	journal	August 2018
Unified Scaling Law for flux pinning in practical superconductors: III. Minimum datasets, core parameters, and application of the Extrapolative Scaling Expression Ekin, Jack W.; Cheggour, Najib; Goodrich, Loren Superconductor Science and Technology, Vol. 30, Issue 3 https://doi.org/10.1088/1361-6668/30/3/033005	journal	February 2017
Beneficial influence of Hf and Zr additions to Nb4at%Ta on the vortex pinning of Nb 3 Sn with and without an O source Balachandran, Shreyas; Tarantini, Chiara; Lee, Peter J. Superconductor Science and Technology, Vol. 32, Issue 4 https://doi.org/10.1088/1361-6668/aaff02	journal	February 2019
Ta, Ti and Hf effects on Nb ₃ Sn high-field performance: temperature-dependent dopant occupancy and failure of Kramer extrapolation Tarantini, Chiara; Balachandran, Shreyas; Heald, Steve M. Superconductor Science and Technology, Vol. 32, Issue 12 https://doi.org/10.1088/1361-6668/ab4d9e	journal	November 2019

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Nb3Sn wire
doping effect
Tc distribution
chemical homogeneity

Title: Significant enhancement of compositional and superconducting homogeneity in Ti rather than Ta-doped Nb3Sn

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