High-energy spin fluctuation in low-Tc iron-based superconductor LaFePO0.9

Motoyuki Ishikado, Shin ichi Shamoto, Katsuaki Kodama, Ryoichi Kajimoto, Mitsutaka Nakamura, Tao Hong, Hannu Mutka

研究成果: Article同行評審

2 引文 斯高帕斯(Scopus)

摘要

Spin fluctuations are widely believed to play an important role in the superconducting mechanisms of unconventional high temperature superconductors. Spin fluctuations have been observed in iron-based superconductors as well. However, in some iron-based superconductors such as LaFePO0.9, they have not been observed by inelastic neutron scattering (INS). LaFePO0.9 is an iron-based superconductor with a low superconducting transition temperature (Tc = 5 K), where line nodes are observed in the superconducting gap function. The line-node symmetry typically originates from sign reversal of the order parameter in spin-fluctuation-mediated superconductivity. This contradiction has been a long-standing mystery of this superconductor. Herein, spin fluctuations were found at high energies such as 30–50 meV with comparable intensities to an optimally doped LaFeAs(O, F). Based on this finding, the line-node symmetry can be explained naturally as spin-fluctuation-mediated superconductivity.

原文English
文章編號16343
期刊Scientific reports
8
發行號1
DOIs
出版狀態Published - 2018 12月 1

All Science Journal Classification (ASJC) codes

  • 多學科

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