Non-trivial role of interlayer cation states in iron-based superconductors

Abstract

Unconventional superconductivity in iron pnictides and chalcogenides has been suggested to be controlled by the interplay of low-energy antiferromagnetic spin fluctuations and the particular topology of the Fermi surface in these materials. Based on this premise, one would also expect the large class of isostructural and isoelectronic iron germanide compounds to be good superconductors. As a matter of fact, they, however, superconduct at very low temperatures or not at all. In this work we establish that superconductivity in iron germanides is suppressed by strong ferromagnetic tendencies, which surprisingly do not originate from changes in bond-angles or -distances with respect to iron pnictides and chalcogenides, but are due to changes in the electronic structure in a wide range of energies happening upon substitution of atom species (As by Ge and the corresponding spacer cations). Our results indicate that superconductivity in iron-based materials may not always be fully understood based on $d$ or $dp$ model Hamiltonians only.

References in corpus (34)

• Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
• Gap symmetry and structure of Fe-based superconductors
• Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
• High Temperature Superconductivity in Iron Pnictides and Chalcogenides
• Enhancement of superconducting transition temperature of FeSe by intercalation of a molecular spacer layer
• Electronic structure and magnetism in Ru based perovskites
• Iron-Based Superconductors: current status of materials and pairing mechanism
• Effect of magnetic frustration on nematicity and superconductivity in Fe chalcogenides
• Structure, antiferromagnetism and superconductivity of the layered iron arsenide NaFeAs
• Concepts relating magnetic interactions, intertwined electronic orders and strongly correlated superconductivity
• Anomalous correlation effects and unique phase diagram of electron doped FeSe revealed by angle resolved photoemission spectroscopy
• Spin dynamics and an orbital-antiphase pairing symmetry in iron-based superconductors
• Soft chemical control of superconductivity in lithium iron selenide hydroxides Li1-xFex(OH)Fe1-ySe
• Effects of correlation in LiFeAs
• Anisotropic magnetization, specific heat and resistivity of RFe2Ge2 single crystals
• Magnetic interactions in iron superconductors: A review
• Orbital selective Fermi surface shifts and mechanism of high T${}_c$ superconductivity in correlated AFeAs (A=Li,Na)
• Unified picture of the doping dependence of superconducting transition temperatures in alkali metal/ammonia intercalated FeSe
• Quantum criticality in AFe2As2 with A = K, Rb, and Cs suppresses superconductivity
• Microscopic nature of correlations in multi-orbital AFe2As2 (A=K, Rb, Cs): Hund's coupling versus Coulomb repulsion
• Unconventional superconductivity in the layered iron germanide YFe${}_2$Ge${}_2$
• Fermi liquid breakdown and evidence for superconductivity in YFe${}_2$Ge${}_2$
• High-temperature superconductivity stabilized by electron-hole interband coupling in collapsed tetragonal phase of KFe2As2 under high pressure
• Competing Magnetic Fluctuations in Iron Pnictide Superconductors: Role of Ferromagnetic Spin Correlations Revealed by NMR
• Superconductivity and Magnetism in YFe${}_2$Ge${}_2$
• Origin of the superconducting state in the collapsed tetragonal phase of KFe2As2
• Unconventional sign-changing superconductivity near quantum criticality in YFe${}_2$Ge${}_2$
• Spectroscopic Evidence for Strong Quantum Spin Fluctuations with Itinerant Character in YFe2Ge2
• Crystal growth and annealing study of fragile, non-bulk superconductivity in YFe${}_2$Ge${}_2$
• Effects of substitution on low temperature physical properties of LuFe2Ge2
• Electronic structure and de Haas-van Alphen frequencies in KFe2As2 within LDA+DMFT
• Tripling the critical temperature of KFe${}_2$As${}_2$ by carrier switch
• Why MgFeGe is not a superconductor
• Possible Way to Make MgFeGe a New Fe-based Superconductor

Cited by in corpus (10)

• Iron-based superconductivity extended to the novel silicide LaFeSiH
• Emergent magnetic degeneracy in iron pnictides due to the interplay between spin-orbit coupling and quantum fluctuations
• Novel Fe-based superconductor LaFe2As2 in comparison with traditional pnictides
• Coexistence of ferromagnetic and stripe-type antiferromagnetic spin fluctuations in YFe${}_2$Ge${}_2$
• Approaching itinerant magnetic quantum criticality through a Hund's coupling induced electronic crossover in the YFe${}_2$Ge${}_2$ superconductor
• Suppression of ferromagnetism governed by a critical lattice parameter in CeTiGe$\_3$ with hydrostatic pressure or V substitution
• Composition dependence of bulk superconductivity in YFe2Ge2
• Importance of Fermi surface and magnetic interactions for the superconducting dome in electron doped FeSe intercalates
• Magnetic competition in iron-based germanide and silicide superconductors
• PhD Thesis: Electronic correlations in multiorbital systems