Anomalous correlation effects and unique phase diagram of electron-doped FeSe revealed by photoemission spectroscopy
書誌事項
- 公開日
- 2016-03-08
- 権利情報
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- https://creativecommons.org/licenses/by/4.0
- https://creativecommons.org/licenses/by/4.0
- DOI
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- 10.1038/ncomms10840
- 公開者
- Springer Science and Business Media LLC
説明
<jats:title>Abstract</jats:title><jats:p>FeSe layer-based superconductors exhibit exotic and distinctive properties. The undoped FeSe shows nematicity and superconductivity, while the heavily electron-doped K<jats:sub><jats:italic>x</jats:italic></jats:sub>Fe<jats:sub>2−<jats:italic>y</jats:italic></jats:sub>Se<jats:sub>2</jats:sub> and single-layer FeSe/SrTiO<jats:sub>3</jats:sub> possess high superconducting transition temperatures that pose theoretical challenges. However, a comprehensive study on the doping dependence of an FeSe layer-based superconductor is still lacking due to the lack of a clean means of doping control. Through angle-resolved photoemission spectroscopy studies on K-dosed thick FeSe films and FeSe<jats:sub>0.93</jats:sub>S<jats:sub>0.07</jats:sub> bulk crystals, here we reveal the internal connections between these two types of FeSe-based superconductors, and obtain superconductivity below ∼46 K in an FeSe layer under electron doping without interfacial effects. Moreover, we discover an exotic phase diagram of FeSe with electron doping, including a nematic phase, a superconducting dome, a correlation-driven insulating phase and a metallic phase. Such an anomalous phase diagram unveils the remarkable complexity, and highlights the importance of correlations in FeSe layer-based superconductors.</jats:p>
収録刊行物
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- Nature Communications
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Nature Communications 7 (1), 10840-, 2016-03-08
Springer Science and Business Media LLC
