Low-field anomaly of vortex dynamics in iron-pnictide superconductors |
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| Authors: | T. Tamegai T. Taen H. Yagyuda Y. Nakajima S. Okayasu M. Sasase H. Kitamura T. Murakami T. Kambara Y. Kanai |
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| Affiliation: | 1. Department of Applied Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;2. JST, Transformative Research-Project on Iron Pnictides (TRIP), 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;6. Department of Accelerator and Medical Physics, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan;7. Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;8. Atomic Physics Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;1. Superconductivity Research Laboratory/ISTEC, Tokyo, Japan;2. Waseda University, Tokyo, Japan |
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| Abstract: | Magnetic relaxations in Ba(Fe1?xCox)2As2 before and after swift particle irradiations are measured. The normalized relaxation rate S shows a clear suppression in a pristine sample at low fields below the self-field. Heavy-ion irradiations suppress these anomalies considerably, although there still remain weak features depending on ion species and/or energies. In a proton irradiated sample, the low-field anomaly of S survives although it is smeared compared with that in a pristine sample. All these results indicate that the low-field anomaly of S is suppressed by defects, and correlated defects have stronger effects. Possible origins of the low-field anomaly of S are discussed. |
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