Two-Fold Reduction of J_c Anisotropy in FeSe_0.5Te_0.5 Films Using Low-Energy Proton Irradiation

Journal Article · 01 August 2019 · IEEE Transactions on Applied Superconductivity

DOI: https://doi.org/10.1109/tasc.2019.2900615 · OSTI ID:1506635

Ozaki, Toshinori ^[1]; Li, Qiang  ^[2]; Jaroszynski, Jan ^[3]

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1. Brookhaven National Lab. (BNL), Upton, NY (United States); Kwansei Gakuin Univ., Hyogo (Japan)
2. Brookhaven National Lab. (BNL), Upton, NY (United States)
3. Florida State Univ., Tallahassee, FL (United States)

High in-field performance and low anisotropy of critical current density J_c are important for superconducting wires/tapes in rotating machine and magnet applications. Here, we report measurements of angular dependence of critical current density J_c in pro-ton irradiated FeSe_0.5Te_0.5 (FST) films at magnetic field up to 35 T. Here, we observed two-fold reduction in the J_c anisotropy of FST films at 4.2 K and 15 Tesla magnetic field by irradiation with low-energy (190 keV) proton. In light of recent demonstration of roll-to-roll irradiation process successfully incorporated in the standard 2G HTS long length production wire, low-energy proton irradiation can be a practical solution to enhance the performance of iron-based super-conducting wires and tapes, as low-energy ion sources are inexpensive to operate and are readily available commercially.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: SC0012704
• OSTI ID: 1506635
• Report Number(s): BNL-211520-2019-JAAM
• Journal Information: IEEE Transactions on Applied Superconductivity, Vol. 29, Issue 51; ISSN 1051-8223
• Publisher: Institute of Electrical and Electronics Engineers (IEEE)Copyright Statement
• Country of Publication: United States
• Language: English