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19 April 2024

» arxiv » 1108.2895

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Antiferromagnetic order and superlattice structure in nonsuperconducting and superconducting RbyFe(1.6+x)Se2
Meng Wang ; Miaoyin Wang ; G.N.Li ; Q.Huang ; C.H.Li ; G.T.Tan ; C.L.Zhang ; Huibo Cao ; Wei Tian ; Yang Zhao ; Y.C.Chen ; X.Y.Lu ; Bin Sheng ; H.Q.Luo ; S.L.Li ; M.H.Fang ; J.L.Zarestky ; W.Ratcliff ; M.D.Lumsden ; J.W.Lynn ; Pengcheng Dai ;
Date:	14 Aug 2011
Abstract:	Neutron diffraction has been used to study the lattice and magnetic structures of the insulating and superconducting Rb$_y$Fe$_{1.6+x}$Se$_2$. For the insulating Rb$_{y}$Fe$_{1.6+x}$Se$_2$, neutron polarization analysis and single crystal neutron diffraction unambiguously confirm the earlier proposed $sqrt{5} imessqrt{5}$ block antiferromagnetic structure. For superconducting samples ($T_c=30$ K), we find that in addition to the tetragonal $sqrt{5} imessqrt{5}$ superlattice structure transition at 513 K, the material develops a separate $sqrt{2} imes sqrt{2}$ superlattice structure at a lower temperature of 480 K. These results suggest that superconducting Rb$_{y}$Fe$_{1.6+x}$Se$_2$ is phase separated with coexisting $sqrt{2} imes sqrt{2}$ and $sqrt{5} imessqrt{5}$ superlattice structures.
Source:	arXiv, 1108.2895
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