| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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New Superconductivity Dome in LaFeAsO1−xFx Accompanied by Structural Transition |
| YANG Jie1, ZHOU Rui1, WEI Lin-Lin1, YANG Huai-Xin1, LI Jian-Qi1, ZHAO Zhong-Xian1, ZHENG Guo-Qing1,2** |
1Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190
2Department of Physics, Okayama University, Okayama 700-8530, Japan |
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| Cite this article: |
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YANG Jie, ZHOU Rui, WEI Lin-Lin et al 2015 Chin. Phys. Lett. 32 107401 |
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Abstract High-temperature superconductivity is often found in the vicinity of antiferromagnetism. This is also true in LaFeAsO1−xFx (x≤0.2) and many other iron-based superconductors, which leads to proposals that superconductivity is mediated by fluctuations associated with the nearby magnetism. Here we report the discovery of a new superconductivity dome without low-energy magnetic fluctuations in LaFeAsO1−xFx with 0.25≤x≤0.75, where the maximal critical temperature Tc at xopt=0.5–0.55 is even higher than that at x ≤0.2. By nuclear magnetic resonance and transmission electron microscopy, we show that a C4 rotation symmetry-breaking structural transition takes place for x>0.5 above Tc. Our results point to a new paradigm of high temperature superconductivity.
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Received: 31 August 2015
Published: 30 October 2015
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| PACS: |
74.25.nj
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(Nuclear magnetic resonance)
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74.70.Xa
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(Pnictides and chalcogenides)
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76.60.-k
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(Nuclear magnetic resonance and relaxation)
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74.25.Ha
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(Magnetic properties including vortex structures and related phenomena)
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