2010/09/15 by Y. Nakajima, Nakajima, Y., T. Taen +9
Physics and Astronomy · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.1009.2848
5 pages, 4 figures
arxiv created 2010/09/15 · arxiv updated 2010/09/16
We report the effect of 3 MeV proton irradiation on the suppression of the critical temperature Tc in Ba(Fe1-xCox)2As2 single crystals at under-, optimal-, and over-doping levels. We find that Tc decreases and residual resistivity increases monotonically with increasing dose. We also find no upturn in low-temperature resistivity in contrast with the \yen alpha-particle irradiated NdFeAs(O,F), which suggests that defects induced by the proton irradiation behave as nonmagnetic scattering centers. The critical scattering rate for all samples estimated by three different ways is much higher than that expected in s\yen pm-pairing scenario based on inter-band scattering due to antiferro-magnetic spin fluctuation.