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Room temperature antiferromagnetic order in superconducting X<sub><i>y</i></sub>Fe<sub>2 −<i>x</i></sub>Se<sub>2</sub>(X = Rb, K): a neutron powder diffraction study
Magnetic and crystal structures of superconducting X(y)Fe(2-x)Se₂ (X = Rb and K with T(c) = 31.5 and 29.5 K) have been studied by neutron powder diffraction at room temperature. Both crystals show an ordered iron vacancy pattern and the crystal structure is well described by the I4/m space group with …