Antiferromagnetic order and superlattice structure in nonsuperconducting and superconducting RbyFe1.6+xSe2
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
DOI 10.1103/PhysRevB.84.094504 · Physical Review B
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Abstract
Neutron diffraction has been used to study the lattice and magnetic structures of the insulating and superconducting RbyFe1.6+xSe2. For the insulating RbyFe1.6+xSe2, neutron polarization analysis and single-crystal neutron diffraction unambiguously confirm the earlier proposed 5×5 block antiferromagnetic structure. For superconducting samples (Tc=30 K), we find that in addition to the tetragonal 5×5 superlattice structure transition at 513 K, the material develops a separate 2×2 superlattice structure at a lower temperature of 480 K. These results suggest that superconducting RbyFe1.6+xSe2 is phase separated with coexisting 2×2 and 5×5 superlattice structures.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| RbyFe1.6+xSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
| Rb0.75Fe1.63Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
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