Abstract：
: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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Ishikado M,Shamoto SI,Kodama K,Kajimoto R,Nakamura M,Hong T,Mutka Hdoi
10.1038/s41598-018-33878-xsubject
Has Abstractpub_date
2018-11-05 00:00:00pages
16343issue
1issn
2045-2322pii
10.1038/s41598-018-33878-xjournal_volume
8pub_type
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