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Article overview
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Intrinsic crystal phase separation in antiferromagnetic superconductor RbyFe2-xSe2: a diffraction study | | V. Yu. Pomjakushin
; E. V. Pomjakushina
; A. Krzton-Maziopa
; K. Conder
; D. Chernyshov
; V. Svitlyk
; A. Bosak
; | | Date: |
24 Apr 2012 | | Abstract: | 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 imes surd5 superstructure (I4/m space group)
with AFM ordered Fe spins. The minority phase does not have surd5 imes
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. | | Source: | arXiv, 1204.5449 | | Services: | Forum | Review | PDF | Favorites | |
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