Intrinsic crystal phase separation in antiferromagnetic superconductor RbyFe2-xSe2: a diffraction study

Details Intrinsic crystal phase separation in antiferromagnetic superconductor RbyFe2-xSe2: a diffraction study Intrinsic crystal phase separation in antiferromagnetic superconductor RbyFe2-xSe2: a diffraction study

2012-04-24

arxiv.org/abs/1204.5449v2

Physics

Condensed Matter

Superconductivity

fixed bugs in References. 9 pages, 8 figures, 1 table. Submitted to PRB

Scientific paper

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 symmetry phases. The main phase has the iron vacancy ordered \surd5 \times \surd5 superstructure (I4/m space group) with AFM ordered Fe spins. The minority phase does not have \surd5 \times \surd5 -type of ordering and has smaller in plane lattice constant a and larger tetragonal c-axis and can be well described assuming the parent average vacancy disordered structure (I4/mmm space group) with the refined stoichiometry Rb0.60(5)(Fe1.10(5))Se)2. The minority phase amounts to 8-10% mass fraction. The unit cell volume of the minority phase is 3.2% smaller than the one of the main phase at T = 2 K and has quite different temperature dependence. The minority phase transforms to the main vacancy ordered phase on heating above the phase separation temperature TP = 475 K. The spatial dimensions of the phase domains strongly increase above TP from 1000 \AA to > 2500 \AA due to the merging of the regions of the main phase that were separated by the second phase at low temperatures.

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