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

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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.

Original languageEnglish
Article number16343
JournalScientific reports
Issue number1
Publication statusPublished - 2018 Dec 1

All Science Journal Classification (ASJC) codes

  • General


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