Ferromagnetic interlayer coupling in FeSe1−xSx superconductors revealed by inelastic neutron scattering
Mingwei Ma, Philippe Bourges, Yvan Sidis, Jinzhao Sun, Guoqing Wang, Kazuki Iida, Kazuya Kamazawa, Jitae T. Park, Frederic Bourdarot, Zhian Ren, Yuan Li
DOI 10.1103/PhysRevB.110.174503 · Physical Review B
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Abstract
FeSe1−xSx superconductors are commonly considered layered van der Waals materials with negligible interlayer coupling. Here, using inelastic neutron scattering to study spin excitations in single-crystal samples, we reveal that the magnetic coupling between adjacent Fe layers is ferromagnetic in nature, making the system different from most unconventional superconductors including iron pnictides. The weak interlayer coupling is estimated to be Jc∼ 0.2 meV, in agreement with the short spin-spin correlation length ξc∼0.2c along the c axis. The results provide an experimental basis for establishing a microscopic theoretical model to describe the absence of magnetic order in FeSe1−xSx.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.1 | Pressure not reported | unknown |
| FeSe0.93S0.07 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.5 | Pressure not reported | unknown |
| FeSe0.89S0.11 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.5 | Pressure not reported | unknown |
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