title: High-field transport properties of a P-doped BaFe2As2film on technical substrate.
abstract: High temperature (high-Tc) superconductors like cuprates have superior critical current properties in magnetic fields over other superconductors. However, superconducting wires for high-field-magnet applications are still dominated by low-TcNb3Sn due probably to cost and processing issues. The recent discovery of a second class of high-Tcmaterials, Fe-based superconductors, may provide another option for high-field-magnet wires. In particular, AEFe2As2(AE: Alkali earth elements, AE-122) is one of the best candidates for high-field-magnet applications because of its high upper critical field, Hc2, moderate Hc2anisotropy, and intermediate Tc. Here we report on in-field transport properties of P-doped BaFe2As2(Ba-122) thin films grown on technical substrates by pulsed laser deposition. The P-doped Ba-122 coated conductor exceeds a transport Jcof 105A/cm2at 15 T for main crystallographic directions of the applied field, which is favourable for practical applications. Our P-doped Ba-122 coated conductors show a superior in-field Jcover MgB2and NbTi, and a comparable level to Nb3Sn above 20 T. By analysing the E - J curves for determining Jc, a non-Ohmic linear differential signature is observed at low field due to flux flow along the grain boundaries. However, grain boundaries work as flux pinning centres as demonstrated by the pinning force analysis.
authors.affiliation: Department of Crystalline Materials Science, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan.
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Iida
authors.affiliation: Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Mailbox R3-1, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.
authors.forename: Hikaru
authors.initials: H
authors.lastname: Sato
authors.affiliation: Applied Superconductivity Center, National High Magnetic Field Laboratory, Florida State University, Tallahassee FL 32310, USA.
authors.forename: Chiara
authors.initials: C
authors.lastname: Tarantini
authors.affiliation: Karlsruhe Institute of Technology, Institute for Technical Physics, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Jens
authors.initials: J
authors.lastname: Hänisch
authors.affiliation: Applied Superconductivity Center, National High Magnetic Field Laboratory, Florida State University, Tallahassee FL 32310, USA.
authors.forename: Jan
authors.initials: J
authors.lastname: Jaroszynski
authors.affiliation: Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Mailbox R3-1, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.|Materials Research Center for Element Strategy, Tokyo Institute of Technology, Mailbox SE-6, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.
authors.forename: Hidenori
authors.initials: H
authors.lastname: Hiramatsu
authors.affiliation: Karlsruhe Institute of Technology, Institute for Technical Physics, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Holzapfel
authors.affiliation: Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology, Mailbox R3-1, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.|Materials Research Center for Element Strategy, Tokyo Institute of Technology, Mailbox SE-6, 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan.
authors.forename: Hideo
authors.initials: H
authors.lastname: Hosono