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Phase co-existence and structured diffuse scattering seen by X-ray 3D mapping of reciprocal space for Cs0.8Fe1.6Se2 | | A. Bosak
; V. Svitlyk
; A. Krzton-Maziopa
; E. Pomjakushina
; K. Conder
; V. Pomjakushin
; A. Popov
; D. de Sanctis
; D. Chernyshov
; | | Date: |
12 Dec 2011 | | Abstract: | AxFe2-ySe2 (A=K, Rb, Cs) superconductors may show a complex mixture of
structural phases even in a single crystal form. A full sphere of the
diffraction intensity has been collected, with the help of synchrotron
radiation, for Cs0.8Fe1.6Se2 . In addition to the expected pattern for the
tetragonal phase with ordered Fe vacancies, a diffuse scattering from Cs
occupational disorder has been observed, together with an extra Bragg
contribution from a minor phase. The minor phase, in agreement with previous
findings, is compressed in the tetragonal a-b plane and expanded along the
c-direction; a set of modulated Bragg rods evidences a planar disorder.
Fourfold splitting of the rods as well as the main Bragg peaks for L
eq0 imply
that symmetry of the minor phase is not higher than monoclinic. The monoclinic
distortion was estimated to be 90.7 degrees. Structured diffuse scattering,
observed on top of the Bragg component, relates to the major phase and is
attributed to a correlated distribution of Cs ions. Elastic nature of the
observed scattering was confirmed by additional inelastic X-ray scattering
experiment. Diffuse scattering forms 3D objects that have topological
similarity with what one would expect, under assumptions discussed in the text,
for a Fermi surface nesting. | | Source: | arXiv, 1112.2569 | | Services: | Forum | Review | PDF | Favorites | |
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