3 years ago

Sign reversal of the order parameter in (Li1−xFex)OHFe1−yZnySe

Sign reversal of the order parameter in (Li1−xFex)OHFe1−yZnySe
Dustin Altenfeld, Hai-Hu Wen, Peter J. Hirschfeld, Igor I. Mazin, Ilya Eremin, Xiong Yang, Xiyu Zhu, Zengyi Du, Hai Lin, Huan Yang, Qiangqiang Gu
In iron pnictides, it has been widely perceived that superconductivity is driven by spin fluctuations, which supports the sign reversal between order parameters (OP) on the electron and hole pockets1, 2. The discovery of superconductivity in intercalated or monolayer FeSe at a critical temperature of the order of 40K rekindled interest in Fe-based superconductivity and sent many theorists back to the drawing board3, 4, 5, 6, 7, 8, 9, 10, 11. Indeed, the simple, transparent and largely accepted idea of spin fluctuations scattering electron pairs between hole and electron pockets was shaken by the absence of hole pockets in KxFe2−ySe2. The fact that the superconducting phase was formed by filamentary inclusions in a strongly magnetic matrix12 spoke against a conventional single-sign s-wave (‘s++’) pairing13, and model calculations based on the spin-fluctuation scenario predicted a d-wave state14, 15, which, by symmetry, would have generated gap nodes16. On the other hand, later photoemission experiments indicated a nodeless superconducting state17, 18. After other materials with similar properties were discovered, including (Li1−xFex)OHFeSe, which could be synthesized in a single-phase form

Publisher URL: https://www.nature.com/articles/nphys4299

DOI: 10.1038/nphys4299

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