Robustness of s-wave pairing symmetry in iron-based superconductors and its implications for fundamentals of magnetically driven high-temperature superconductivity

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• 作者：Jiangping Hu ; Jing Yuan
• 关键词：iron ; based superconductors ; cuprates ; unconventional superconductivity ; high ; temperature superconductors
• 刊名：Frontiers of Physics
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：11
• 期：5
• 全文大小：422 KB
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• 作者单位：Jiangping Hu (1) (2) (3)
  Jing Yuan (1)
  
  1. Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
  2. Department of Physics, Purdue University, West Lafayette, IN, 47907, USA
  3. Collaborative Innovation Center of Quantum Matter, Beijing, 100871, China
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Chinese Library of Science
  
• 出版者：Higher Education Press, co-published with Springer-Verlag GmbH
• ISSN：2095-0470

文摘

Based on the assumption that the superconducting state belongs to a single irreducible representation of lattice symmetry, we propose that the pairing symmetry in all measured iron-based superconductors is generally consistent with the A _1g s-wave. Robust s-wave pairing throughout the different families of iron-based superconductors at different doping regions signals two fundamental principles behind high-T _c superconducting mechanisms: (i) the correspondence principle: the short-range magnetic-exchange interactions and the Fermi surfaces act collaboratively to achieve high-T _c superconductivity and determine pairing symmetries; (ii) the magnetic-selection pairing rule: superconductivity is only induced by the magnetic-exchange couplings from the super-exchange mechanism through cation-anion-cation chemical bonding. These principles explain why unconventional high-T _c superconductivity appears to be such a rare but robust phenomena, with its strict requirements regarding the electronic environment. The results will help us to identify new electronic structures that can support high-T _c superconductivity.