English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We have performed Raman-scattering measurements on high-quality singlecrystals 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 weidentify as a two-magnon process involving optical magnons. The intensity ofthe two-magnon peak falls sharply on entering the superconducting phase. Thiseffect, which is entirely absent in the non-superconducting systemKFe$_{1.5}$Se$_2$, requires a strong mutual exclusion betweenantiferromagnetism and superconductivity arising from proximity effects withinregions of microscale phase separation.

Two-magnon Raman scattering in A$_{0.8}$Fe$_{1.6}$Se$_2$ systems: competition between superconductivity and antiferromagnetic order