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Two-magnon Raman scattering in A0.8Fe1.6Se2 systems (A = K, Rb, Cs, and TI): Competition between superconductivity and antiferromagnetic order.
- Source :
-
Physical Review B: Condensed Matter & Materials Physics . Jun2012, Vol. 85 Issue 21, p1-7. 7p. - Publication Year :
- 2012
-
Abstract
- We performed Raman-scattering measurements on high-quality single crystals of A0.8Fe1.6Se2 superconductors of several compositions. We found 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 falls sharply on entering the superconducting phase. This effect, which is entirely absent in the non-superconducting system KFe1.5Se2, requires a strong mutual exclusion between antiferromagnetism and superconductivity arising from proximity effects within regions of microscale phase separation. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10980121
- Volume :
- 85
- Issue :
- 21
- Database :
- Academic Search Index
- Journal :
- Physical Review B: Condensed Matter & Materials Physics
- Publication Type :
- Academic Journal
- Accession number :
- 79172970
- Full Text :
- https://doi.org/10.1103/PhysRevB.85.214508