2015年10月
New Superconductivity Dome in LaFeAsO1-xFx Accompanied by Structural Transition
CHINESE PHYSICS LETTERS
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- 巻
- 32
- 号
- 10
- 開始ページ
- 107401(1)-107401(7)
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1088/0256-307X/32/10/107401
- 出版者・発行元
- IOP PUBLISHING LTD
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 T-c at x(opt) = 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 T-c. Our results point to a new paradigm of high temperature superconductivity.
- リンク情報
- ID情報
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- DOI : 10.1088/0256-307X/32/10/107401
- ISSN : 0256-307X
- eISSN : 1741-3540
- Web of Science ID : WOS:000362944000030