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van der Beek, C.J.; Demirdis,S.; Colson, D.; Rullier-Albenque, F.; Fasano, Y.; Shibauchi, T.; Matsuda, Y.; Kasahara, S.; Gierlowski, P.; Konczykowski, M. |
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Electron irradiation of Co, Ni, and P-doped BaFe2As2–type iron-based superconductors |
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2013 |
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Journal of Physics: Conference Series |
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J. Phys.: Conf. Ser. |
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449 |
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012023 |
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High energy electron irradiation is used to controllably introduce atomic-scale point defects into single crystalline Ba(Fe1−xCox)2As2, Ba(Fe1−xNix)2As2, and BaFe2(As1−xPx)2. The appearance of the collective pinning contribution to the critical current density in BaFe2(As1−xPx)2, and the magnitude of its enhancement in Ba(Fe1−xCox)2As2, conform with the hypothesis of quasi-particle scattering by Fe vacancies created by the irradiation. Whereas the insignificant modification of the temperature dependence of the superfluid density in Ba(Fe1−xCox)2As2 and Ba(Fe1−xNix)2As2 points to important native disorder present before the irradiation, the critical temperatures of these materials undergo a suppression equivalent to that observed in the much cleaner BaFe2(As1−xPx)2. This lends credence to the hypothesis of line nodes of the order parameter (at finite kz) in the former two materials. |
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BT @ pedrazp @ |
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659 |
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