Preferred Magnetic Excitations in the Iron-Based Sr1−xNaxFe2As2 Superconductor
Jianqing Guo, Li Yue, Kazuki Iida, Kazuya Kamazawa, Lei Chen, Tingting Han, Yan Zhang, Yuan Li
DOI 10.1103/PhysRevLett.122.017001 · Physical Review Letters
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Abstract
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 superconductivity 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.”
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr1-xNaxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | Pressure not reported | unknown |
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