The magnetic and crystal structures of Sr1−δFeO2−xFx, a new oxyfluoride

Abstract

A new quasi-two-dimensional oxyfluoride, Sr_1−δFeO_2−xF_x, has been successfully synthesized by combining topotactic fluoridation and CaH₂ reduction. The introduction of F through this synthesis provides a new route to introducing charge carriers into the square layered lattice through the formation of Fe¹⁺ ions. While the average crystal symmetry and magnetic structure remain the same as in the parent compound, the addition of F results in an enhanced buckling of the Fe(O/F)₂ square plaquettes that is most likely topologically driven.