New Superconductivity Dome in LaFeAsO1-xFx Accompanied by Structural Transition

Jie Yang, Rui Zhou, Lin Lin Wei, Huai Xin Yang, Jian Qi Li, Zhong Xian Zhao, Guo Qing Zheng

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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= 0.50.55 is even higher than that at x ≤ 0.2. By nuclear magnetic resonance and transmission electron microscopy, we show that a C 4 rotation symmetry-breaking structural transition takes place for x > 0.5 above Tc. Our results point to a new paradigm of high temperature superconductivity.

Original languageEnglish
Article number107401
JournalChinese Physics Letters
Volume32
Issue number10
DOIs
Publication statusPublished - Jan 1 2015

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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