A shift of the phase diagram in BaFe$_{2}$(As$_{1-}_{x}$P$_{x})_{2\, }$by controlled disorder

The relationship between unconventional superconductivity and quantum critical point (QCP) is one of the most important issues in strongly correlated electron systems. A systematic study on the impurity scattering is performed in iron-based superconductor BaFe$_{2}$(As$_{1-}_{x}$P$_{x})_{2}$, in which clear evidence for QCP has recently been presented[1]. We introduce point defects into BaFe$_{2}$(As$_{1-}_{x}$P$_{x})_{2}$ by electron irradiation, which has less effects on lattice constant and carrier density compared to the chemical substitution of atoms[2]. Here, we report on the changes of the magnetic and superconducting transition temperatures with electron irradiation in a wide range of substitution, from which we discuss the effect of impurity scattering on superconducting dome and QCP. [1]T. Shibauchi \textit{et al}., Annu. Rev. Condens. Matter Phys. \textbf{5}, 113 (2014). [2]Y. Mizukami \textit{et al}., Nat. Commun. \textbf{5}, 5657 (2014).