期刊
PHYSICAL REVIEW B
卷 85, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.214508
关键词
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资金
- 973 program [2011CBA00112]
- NSF of China [10874215, 10934008, 11034012]
- Fundamental Research Funds for Central Universities
- RUC
We performed Raman-scattering measurements on high-quality single crystals of A(0.8)Fe(1.6)Se(2) 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.
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