Physics – Condensed Matter – Superconductivity
Scientific paper
2011-06-14
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures
Scientific paper
We have performed Raman-scattering measurements on high-quality single crystals of A$_{0.8}$Fe$_{1.6}$Se$_2$ superconductors of several compositions. We find a broad, asymmetric peak around 1600 cm$^{-1}$ (200 meV), which we identify as a two-magnon process involving optical magnons. The intensity of the two-magnon peak undergoes a clear, step-like reduction on entering the superconducting phase. This behavior, which is entirely absent in the non-superconducting system KFe$_{1.5}$Se$_2$, strongly suggests a microscopic coexistence of antiferromagnetic order and superconductivity in the A$_{0.8}$Fe$_{1.6}$Se$_2$ system. We further observe a series of small peaks within the two-magnon signal whose 100$-$150 cm$^{-1}$ spacings reflect the fine structure of the optical magnon bands.
Chen Guo-Feng
He J.-B.
Li Shi-Yan
Normand Bruce
Wang Michelle D.
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