Effect of 1.5 MeV Proton Irradiation on Superconductivity in FeSe0.5Te0.5 Thin Films

Quantum Beam Science

Itsuhiro Kakeya¹  Takuya Kashihara²  Toshinori Ozaki²  Ryoya Ishigami³ 

[1] Department of Electronic Science and Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan;Department of Nanotechnology for Sustainable Energy, Kwansei Gakuin University, 2-1 Gakuen, Sanda 669-1337, Japan;The Wakasa Wan Energy Research Center, Nagatani, Tsuruga 914-0192, Japan;

关键词: superconductor;    irradiation;    critical current;   

DOI  :  10.3390/qubs5020018

来源: DOAJ

【 摘 要 】

Raising the critical current density J_c in magnetic fields is crucial to applications such as rotation machines, generators for wind turbines and magnet use in medical imaging machines. The increase in J_c has been achieved by introducing structural defects including precipitates and vacancies. Recently, a low-energy ion irradiation has been revisited as a practically feasible approach to create nanoscale defects, resulting in an increase in J_c in magnetic fields. In this paper, we report the effect of proton irradiation with 1.5 MeV on superconducting properties of iron–chalcogenide FeSe_0.5Te_0.5 films through the transport and magnetization measurements. The 1.5 MeV proton irradiation with 1 × 10¹⁶ p/cm² yields the highest J_c increase, approximately 30% at 5–10 K and below 1 T without any reduction in T_c. These results indicate that 1.5 MeV proton irradiations could be a practical tool to enhance the performance of iron-based superconducting tapes under magnetic fields.

【 授权许可】

Unknown