Electronic Structure, Magnetism and Superconductivity of Layered Iron Compounds

Abstract

The layered iron superconductors are discussed using electronic structure calculations. The four families of compounds discovered so far, including Fe(Se,Te) have closely related electronic structures. The Fermi surface consists of disconnected hole and electron cylinders and additional hole sections that depend on the specific material. This places the materials in proximity to itinerant magnetism, both due to the high density of states and due to nesting. Comparison of density functional results and experiment provides strong evidence for itinerant spin fluctuations, which are discussed in relation to superconductivity. It is proposed that the intermediate phase between the structural transition and the SDW transition in the oxy-pnictides is a nematic phase.

Proceedings ISS2008

References in corpus (26)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• The superconductivity at 18 K in LiFeAs system
• Density functional study of FeS, FeSe and FeTe: Electronic structure, magnetism, phonons and superconductivity
• Theory of Electron Nematic Order in LaOFeAs
• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
• Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11
• Formation of a Nematic Fluid at High Fields in Sr3Ru2O7
• Electronic Structure and Doping in BaFe${}_2$As${}_2$ and LiFeAs: Density Functional Calculations
• The challenge of unravelling magnetic properties in LaFeAsO
• Electronic structure of the iron-based superconductor LaOFeP
• Phase transitions in LaFeAsO: structural, magnetic, elastic, and transport properties, heat capacity and Mossbauer spectra
• Electron-Hole Symmetry and Magnetic Coupling in Antiferromagnetic LaOFeAs
• A key role for unusual spin dynamics in ferropnictides
• Momentum dependence of the superconducting gap in NdFeAsO1-xFx single crystals measured by angle resolved photoemission spectroscopy
• Doping-dependent Phase Diagram of LaO{\it M}As ({\it M}=V--Cu) and Electron-type Superconductivity near Ferromagnetic Instability
• The Fermi surface of Ba(1-x)K(x)Fe2As2 and its evolution with doping
• Iron-based layered superconductor LaO${}_{1-x}$F${}_x$FeAs: an antiferromagnetic semimetal
• First Order Phase Transition and Superconductivity in BaNi2As2 Single Crystals
• Electronic Structure of Prototype AFe_2As_2 and ReOFeAs High-Temperature Superconductors: a Comparison
• Evidence for Strong Itinerant Spin Fluctuations in the Normal State of CeFeAsO(0.89)F(0.11) Iron-Oxypnictides
• Electron Phonon Superconductivity in LaNiOP

Cited by in corpus (10)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Magnetism in Fe-based superconductors
• Phase Diagram of Ba1-xKxFe2As2
• Structure and Anisotropic Properties of BaFe2-xNixAs2 (x = 0, 1, 2) Single Crystals
• Dispersive Spin Fluctuations in the near optimally-doped superconductor Ba(Fe1-xCox)2As2 ($x$=0.065)
• Hall effect in superconducting Fe(Se0.5Te0.5) thin films
• Electronic Structure of KFe${}_2$Se${}_2$ from First Principles Calculations
• BaT2As2 Single Crystals (T = Fe, Co, Ni) and Superconductivity upon Co-doping
• Phase separation of antiferromagnetic ground states in systems with imperfect nesting
• Superconductivity and Antiferromagnetism In Fe(Te1-xSx)y System