Superconductivity mediated by the antiferromagnetic spin-wave in chalcogenide iron-base superconductors

Abstract

The ground state of K${}_{0.8+x}$Fe${}_{1.6+y}$Se${}_2$ and other iron-based selenide superconductors are doped antiferromagnetic semiconductors. There are well defined iron local moments whose energies are separated from those of conduction electrons by a large band gap in these materials. We propose that the low energy physics of this system is governed by a model Hamiltonian of interacting electrons with on-site ferromagnetic exchange interactions and inter-site 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.

4 pages, 3 figures

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• The Unexpected Properties of Alkali Metal Iron Selenide Superconductors
• Phase diagram of (Li1-xFex)OHFeSe: a bridge between iron selenide and arsenide superconductors
• Spin-wave excitations and superconducting resonant mode in Cs(x)Fe(2-y)Se2
• Spin reorientation in TlFe1.6Se2 with complete vacancy ordering
• Phase diagram and a possible unified description of intercalated iron selenide superconductors
• Local spin fluctuations in iron-based superconductors: 77Se and 87Rb NMR measurements of Tl0.47Rb0.34Fe1.63Se2
• Lattice dynamics of KNi2Se2
• Pair-checkerboard antiferromagnetic order in $\beta$-Fe${}_4$Se${}_5$ with $\sqrt{5}\times \sqrt{5}$ ordered Fe vacancies
• Dynamic approach to finite-temperature magnetic phase transitions in the extended J1- J2 model with vacancy order
• Spin waves in the block checkerboard antiferromagnetic phase
• Disentangling Electron-Boson Interactions on the Surface of a Familiar Ferromagnet