A minimum single-band model for low-energy excitations in superconducting KFeSe
arXiv:1108.3491 · doi:10.1140/epjb/e2012-30315-8
Abstract
We propose a minimum single-band model for the newly discovered iron-based superconducting KFeSe. Our model is found to be numerically consistent with the five-orbital model at low energies. Based on our model and the random phase approximation, we study the spin fluctuation and the pairing symmetry of superconducting gap function. The spin excitation and the pairing symmetry are revealed. All of the results can well be understood in terms of the interplay between the Fermi surface topology and the local spin interaction, providing a sound picture to explain why the superconducting transition temperature is as high as to be comparable to those in pnictides and some cuprates. A common origin of superconductivity is elucidated for this compound and other high-T materials.
5 pages, 4 figures
References in corpus (18)
- Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsOF}
- A minimal two-band model for the superconducting Fe-pnictides
- Heavily electron-doped electronic structure and isotropic superconducting gap in AxFe2Se2 (A=K,Cs)
- Fe-based high temperature superconductivity with Tc=31K bordering an insulating antiferromagnet in (Tl,K)FexSe2 Crystals
- Phase Separation and Magnetic Order in K-doped Iron Selenide Superconductor
- Nanoscale phase separation in the iron chalcogenide superconductor K0.8Fe1.6Se2 as seen via scanning nanofocused x-ray diffraction
- d-wave pairing from spin fluctuations in the KxFe{2-y}Se2 superconductors
- Spin Fluctuations, Interband Coupling, and Unconventional Pairing in Iron-based Superconductors
- Strong nodeless pairing on separate electron Fermi surface sheets in (Tl, K)FeSe probed by ARPES
- A Generic Two-band Model for Unconventional Superconductivity and Spin-Density-Wave Order in Electron and Hole Doped Iron-Based Superconductors
- Mott transition in Modulated Lattices and Parent Insulator of (K,Tl)yFexSe2 Superconductors
- Angle-resolved photoemission evidence of s-wave superconducting gap in KxFe2-ySe2 superconductor
- Reciprocal-space structure and dispersion of the magnetic resonant mode in the superconducting phase of Rb(x)Fe(2-y)Se2 single crystals
- Emergence of Fully-Gapped -wave and Nodal d-wave States Mediated by Orbital- and Spin-Fluctuations in Ten-Orbital Model for KFeSe
- Stripes, spin resonance and pairing symmetry in FeSe-based layered superconductors
- Electronic and magnetic structures of ternary iron selenides AFeSe (A=K, Cs, or Tl)
- Possible Superconducting Symmetry and Magnetic Correlations in K0.8Fe2Se2: A 77Se-NMR Study
- Phenomenological theory of spin excitations in La- and Y-based cuprates