Superconductivity mediated by the antiferromagnetic spin wave in chalcogenide iron-based superconductors
G. M. Zhang, Z. Y. Lu, T. Xiang
DOI 10.1103/PhysRevB.84.052502 · Physical Review B
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Abstract
The ground state of K0.8+xFe1.6+ySe2 and other iron-based selenide superconductors are doped antiferromagnetic semiconductors. We propose that the low energy physics of this system is governed by a model Hamiltonian of interacting electrons with onsite ferromagnetic exchange interactions and intersite superexchange interactions. We have derived the effective pairing potential of electrons under the linear spin-wave approximation and shown that the superconductivity can be driven by mediating coherent spin-wave excitations in these materials. Our work provides a natural account for the coexistence of superconducting and antiferromagnetic long range orders observed by neutron scattering and other experiments.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| K0.8Fe2Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
| Cs0.8Fe2Se1.96 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | unknown |
| K0.82(2)Fe1.626(3)Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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