Journal
PHYSICAL REVIEW LETTERS
Volume 122, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.017001
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Funding
- National Natural Science Foundation of China [11522429, 11874069]
- Ministry of Science and Technology of China [2015CB921302, 2018YFA0305602]
- MLF, J-PARC, Japan [2017B0153]
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With spin-orbit coupling, both local-moment magnetism and itinerant electrons are expected to behave anisotropically in spin space, but such effects' influence on the formation of unconventional super-conductivity has been hitherto unexplored. Here, in an iron-based superconductor, Sr1-xNaxFe2As2, we report spectroscopic evidence that itinerant electrons prefer to be assisted by c-axis polarized magnetic excitations in their formation of superconducting Cooper pairs, against the polarization of the local-moment excitations. Our result naturally explains why the superconductivity competes strongly with the tetragonal magnetic phase in this material, and provides a fresh view on how to make a good superconductor out of a magnetic Hund's metal.
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