The synthesis, and crystal and magnetic structure of the iron selenide BaFe2Se3with possible superconductivity atTc= 11 K
- 19 September 2011
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 23 (40), 402201
- https://doi.org/10.1088/0953-8984/23/40/402201
Abstract
We report on the synthesis of single crystals of BaFe(2)Se(3) and study their crystal and magnetic structures by means of synchrotron single-crystal x-ray and neutron powder diffraction. The crystal structure has orthorhombic symmetry and consists of double chains of FeSe(4) edge connected tetrahedra intercalated with barium. Below 240 K, long range spin-block checkerboard antiferromagnetic order is developed. The magnetic structure is similar to one observed in A(0.8)Fe(1.6)Se(2) (A = K, Rb or Cs) superconductors. The crystals exhibit a transition to the diamagnetic state with an onset transition temperature of T(c) ∼ 11 K. Though we observe FeSe as an impurity phase (<0.8% mass fraction) it is not likely that the diamagnetism is attributable to the FeSe superconductor, which has T(c) ≈ 8.5 K.Keywords
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