Phase diagram and a possible unified description of intercalated iron selenide superconductors

Abstract

We propose a theoretical description of the phase diagram and physical properties in A2Fe4Se5-type (A=K, Tl) compounds based on a coexistent local moment and itinerant electron picture. Using neutron scattering and ARPES measurements to fix the general structure of the local moment and itinerant Fermi pockets, we find a superconducting (SC) regime with s-wave pairing at the M pockets and an incipient sign-change s-wave near the Gamma point, which is adjacent to an insulating state at low doping and a charge-density-wave (CDW) state at high doping. The uniform susceptibility and resistivity are found to be consistent with the experiment. The main distinction with iron pnictide superconductors is also discussed.

4 pages, 5 figures

References in corpus (22)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• High-temperature superconductivity in iron-based materials
• Superconductivity and Phase Diagram in the Iron-based Arsenic-oxides ReFeAsO1-delta (Re = rare earth metal) without F-Doping
• 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
• A Novel Large Moment Antiferromagnetic Order in K0.8Fe1.6Se2 Superconductor
• Common Crystalline and Magnetic Structure of superconducting A2Fe4Se5
• Distinct Fermi Surface Topology and Nodeless Superconducting Gap in (Tl0.58Rb0.42)Fe1.72Se2 Superconductor
• Hund's coupling key role in multi-orbital correlations
• Unified Picture for Magnetic Correlations in Iron-Based Superconductors
• Coexistence of Magnetism and Superconductivity in the Iron-based Compound Cs_0.8(FeSe_0.98)_2
• On the Structure of Vacancy Ordered Superconducting Alkali Metal Iron Selenide
• Strong nodeless pairing on separate electron Fermi surface sheets in (Tl, K)Fe${}_{1.78}$Se${}_2$ probed by ARPES
• Coexistence of superconductivity and antiferromagnetism in single crystals $A_{0.8}F{e}_{2-y}S{e}_2$ (A= K, Rb, Cs, Tl/K and Tl/Rb): evidence from magnetization and resistivity
• Ternary iron selenide K${}_{0.8}$Fe${}_{1.6}$Se${}_2$ is an antiferromagnetic semiconductor
• Mott transition in Modulated Lattices and Parent Insulator of (K,Tl)yFexSe2 Superconductors
• Cation vacancy order in the K0.8+xFe1.6-ySe2 system: five-fold cell expansion accommodates 20% tetrahedral vacancies
• Block Spin Ground State and 3-Dimensionality of (K,Tl)Fe${}_{1.6}$Se${}_2$
• Theory for superconductivity in (Tl,K)Fe${}_x$Se${}_2$ as a doped Mott insulator
• Antiferromagnetic order and superlattice structure in nonsuperconducting and superconducting RbyFe(1.6+x)Se2
• Magnetic and superconducting instabilities in a hybrid model of itinerant/localized electrons for iron pnictides
• Superconductivity mediated by the antiferromagnetic spin-wave in chalcogenide iron-base superconductors

Cited by in corpus (15)

• The Unexpected Properties of Alkali Metal Iron Selenide Superconductors
• Interplay between magnetism and superconductivity in iron-chalcogenide superconductors: crystal growth and characterizations
• Angle-resolved photoemission evidence of s-wave superconducting gap in KxFe2-ySe2 superconductor
• Observation of strong electron pairing on bands without Fermi surfaces in LiFe1-xCoxAs
• Functional renormalization group study of the pairing symmetry and pairing mechanism in iron-selenide superconductors
• A General Mechanism for Orbital Selective Phase Transitions
• Novel Insulating Magnetism in Vacancy-Ordered K2Fe4Se5
• Neutron Scattering Study on Spin Dynamics in Superconducting (Tl,Rb)2Fe4Se5
• Transitions from a Kondo-like diamagnetic insulator into a modulated ferromagnetic metal in ${\mathrm{FeGa}}_{3-\mathbf{y}}{\mathrm{Ge}}_{\mathbf{y}}$
• Can Orbital-Selective Néel Transitions Survive Strong Nonlocal Electronic Correlations?
• Electronic structure of vacancy-ordered iron-selenide K${}_{0.5}$Fe${}_{1.75}$Se${}_2$
• Orbital Selective Phase Transition
• Identifying the dominant pairing interaction in high-$T_c$ FeSe superconductors through Leggett modes
• Distinct Nature of Orbital Selective Mott Phases Dominated by the Low-energy Local Spin Fluctuations
• Paramagnetic spin excitations in insulating Rb${}_{0.8}$Fe${}_{1.6}$Se${}_2$