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Antiferromagnetic order and superlattice structure in nonsuperconducting and superconducting Rb(y)Fe(1.6+x)Se(2)

TitleAntiferromagnetic order and superlattice structure in nonsuperconducting and superconducting Rb(y)Fe(1.6+x)Se(2)
Publication TypeJournal Article
Year of Publication2011
AuthorsWang M, Wang MY, Li GN, Huang Q, Li CH, Tan GT, Zhang CL, Cao HB, Tian W, Zhao Y, Chen YC, Lu XY, Sheng B, Luo HQ, Li SL, Fang MH, Zarestky JL, Ratcliff W, Lumsden MD, Lynn JW, Dai PC
Journal TitlePhysical Review B
Volume84
Pages094504
Date Published09
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000294773500008
Keywordscompeting orders, high-temperature superconductivity, iron, NEUTRON
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 root 5 x root 5 block antiferromagnetic structure. For superconducting samples (T(c) = 30 K), we find that in addition to the tetragonal root 5 x root 5 superlattice structure transition at 513 K, the material develops a separate root 2 x root 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 root 2 x root 2 and root 5 x root 5 superlattice structures.
DOI10.1103/PhysRevB.84.094504
Alternate JournalPhys. Rev. B