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Intrinsic crystal phase separation in the antiferromagnetic superconductor Rb<sub><i>y</i></sub>Fe<sub>2โ<i>x</i></sub>Se<sub>2</sub>: a diffraction study
The crystal and magnetic structures of the superconducting iron based chalcogenides RbyFe2-xSe2 have been studied by means of single crystal synchrotron x-ray and high resolution neutron powder diffraction in the temperature range 2-570 K. The ground state of the crystal is an intrinsically phase separated state with two distinct by โฆ