H+ irradiation effect in Co-doped BaFe2As2 single crystals |
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| Authors: | Y. Nakajima Y. Tsuchiya T. Taen T. Tamegai H. Kitamura T. Murakami |
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| Affiliation: | 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. National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan;1. Superconductivity Research Laboratory/ISTEC, Tokyo, Japan;2. Waseda University, Tokyo, Japan |
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| Abstract: | We report the suppression of the critical temperature Tc in single crystalline Ba(Fe1?xCox)2As2 at under-, optimal-, and over-doping levels by 3 MeV proton irradiation. Tc decreases and residual resistivity increases monotonically with increasing the dose. The low-temperature resistivity does not show the upturn in contrast with the α-particle irradiated NdFeAs(O,F), which suggests that proton irradiation introduces nonmagnetic scattering centers. Critical scattering rates for all samples obtained by three different ways are much higher than that expected in s±-pairing scenario based on inter-band scattering due to antiferro-magnetic spin fluctuations. |
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