|
|||||
|
|
Critical current densities and flux creep rate in Co-doped BaFe2As2 with columnar defects introduced by heavy-Ion irradiation |
|
| Authors: | Y Nakajima Y Tsuchiya T Taen H Yagyuda T Tamegai S Okayasu M Sasase H Kitamura T Murakami |
| Institution: | 1. Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;2. JST, Transformative Research-Project on Iron Pnictides (TRIP), 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;3. Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;4. The Wakasa-wan Energy Research Center, Research and Development Group, 64-52-1 Nagatani, Tsuruga, Fukui 914-0192, Japan;5. Radiation Measurement Research Section, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan |
| Abstract: | We report the formation of columnar defects in Co-doped BaFe2As2 single crystals with different heavy-ion irradiations. The formation of columnar defects by 200 MeV Au ion irradiation is confirmed by transmission electron microscopy and their density is about 40% of the irradiation dose. Magneto-optical imaging and bulk magnetization measurements reveal that the critical current density Jc is enhanced in the 200 MeV Au and 800 MeV Xe ion irradiated samples while Jc is unchanged in the 200 MeV Ni ion irradiated sample. We also find that vortex creep rates are strongly suppressed by the columnar defects. We compare the effect of heavy-ion irradiation into Co-doped BaFe2As2 and cuprate superconductors. |
| Keywords: | Iron-pnictide superconductor Critical current density Flux creep |
| 本文献已被 ScienceDirect 等数据库收录！ | |