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Effects of electron irradiation on resistivity and London penetration depth of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Ba</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">K</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">Fe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">As</mml:mi><mml:mn>2</mml:mn></…
Irradiation with 2.5 MeV electrons at doses up to $5.2\ifmmode\times\else\texttimes\fi{}{10}^{19} \mathrm{electrons}/\mathrm{cm}{}^{2}$ was used to introduce pointlike defects in single crystals of ${\mathrm{Ba}}_{1\ensuremath{-}x}{\mathrm{K}}_{x}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$ with $x=0.19 ({T}_{c}=14\phantom{\rule{0.16em}{0ex}}\mathrm{K}),0.26 ({T}_{c}=32\phantom{\rule{0.16em}{0ex}}\mathrm{K}), 0.32 ({T}_{c}=37\phantom{\rule{0.16em}{0ex}}\mathrm{K})$, and $0.34 ({T}_{c}=39\phantom{\rule{0.16em}{0ex}}\mathrm{K})$ to study the superconducting gap structure by probing the effect of nonmagnetic scattering on electrical resistivity $\ensuremath{\rho}(T)$ and London …