2012/02/08 by Tao Zhou, Zhou, Tao, Z. D. Wang +1
Chemistry · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Inorganic Chemistry and Materials #Iron-based superconductors research #Rare-earth and actinide compounds #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.1202.1607
openalex publication_date 2012/02/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We propose an effective single-band model for the newly discovered iron selenide superconductors AxFe2-ySe2 (A=Tl,K,Rb,Cs). Based on this minimum model and the random phase approximation, the dx2-y2 pairing symmetry is revealed theoretically, which may be understood in the framework of Fermi surface topology. A common origin of superconductivity is elucidated for this compound and other high-Tc materials. The spin excitations at (π,π/2) in superconducting states are observed, in good agreement with the neutron scattering experiments. The spin resonance is indicated to show up only for the d-wave pairing, which provides an additional indication for the d-wave pairing symmetry in this family of superconductors.