title: Ultra-high performance, high-temperature superconducting wires via cost-effective, scalable, co-evaporation process.
abstract: Long-length, high-temperature superconducting (HTS) wires capable of carrying high critical current, Ic, are required for a wide range of applications. Here, we report extremely high performance HTS wires based on 5 μm thick SmBa2Cu3O7--δ (SmBCO) single layer films on textured metallic templates. SmBCO layer wires over 20 meters long were deposited by a cost-effective, scalable co-evaporation process using a batch-type drum in a dual chamber. All deposition parameters influencing the composition, phase, and texture of the films were optimized via a unique combinatorial method that is broadly applicable for co-evaporation of other promising complex materials containing several cations. Thick SmBCO layers deposited under optimized conditions exhibit excellent cube-on-cube epitaxy. Such excellent structural epitaxy over the entire thickness results in exceptionally high Ic performance, with average Ic over 1,000 A/cm-width for the entire 22 meter long wire and maximum Ic over 1,500 A/cm-width for a short 12 cm long tape. The Ic values reported in this work are the highest values ever reported from any lengths of cuprate-based HTS wire or conductor.
authors.affiliation: Korea Electrotechnology Research Institute, Changwon, Gyeongnam 641-120, Korea.
authors.forename: Ho-Sup
authors.initials: HS
authors.lastname: Kim
authors.affiliation: Korea Electrotechnology Research Institute, Changwon, Gyeongnam 641-120, Korea.
authors.forename: Sang-Soo
authors.initials: SS
authors.lastname: Oh
authors.affiliation: Korea Electrotechnology Research Institute, Changwon, Gyeongnam 641-120, Korea.
authors.forename: Hong-Soo
authors.initials: HS
authors.lastname: Ha
authors.affiliation: Korea Advanced Institute of Science & Technology, Daejon, Korea.
authors.forename: Dojun
authors.initials: D
authors.lastname: Youm
authors.affiliation: SuNAM Co. Ltd., Anseong-si, Gyeonggi-do 456-812, Korea.
authors.forename: Seung-Hyun
authors.initials: SH
authors.lastname: Moon
authors.affiliation: University of Wollongong, North Wollongong, NSW 2500, Australia.
authors.forename: Jung Ho
authors.initials: JH
authors.lastname: Kim
authors.affiliation: University of Wollongong, North Wollongong, NSW 2500, Australia.
authors.forename: Shi Xue
authors.initials: SX
authors.lastname: Dou
authors.affiliation: Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Yoon-Uk
authors.initials: YU
authors.lastname: Heo
authors.affiliation: Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
authors.forename: Sung-Hun
authors.initials: SH
authors.lastname: Wee
authors.affiliation: Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
authors.forename: Amit
authors.initials: A
authors.lastname: Goyal
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