Superconductivity tuned by the iron vacancy order in K${}_{\mathbf{x}}$Fe${}_{2-\mathbf{y}}$Se${}_2$

Wei Bao, G. N. Li, Q. Huang +6

Combining in-depth neutron diffraction and systematic bulk studies, we discover that the $\sqrt{5}\times \sqrt{5}$ Fe vacancy order with its associated block antiferromagnetic order…