Magnetism in Fe-based superconductors

Abstract

In this review, we present a summary of experimental studies of magnetism in Fe-based superconductors. The doping dependent phase diagram shows strong similarities to the generic phase diagram of the cuprates. Parent compounds exhibit magnetic order together with a structural phase transition both of which are progressively suppressed with doping allowing superconductivity to emerge. The stripe-like spin arrangement of Fe moments in the magnetically ordered state shows the identical in-plane structure for the RFeAsO (R=rare earth) and AFe2As2 (A=Sr, Ca, Ba, Eu and K) parent compounds, notably different than the spin configuration of the cuprates. Interestingly, Fe1+yTe orders with a different spin order despite very similar Fermi surface topology. Studies of the spin dynamics in the parent compounds shows that the interactions are best characterized as anisotropic three-dimensional (3D) interactions. Despite the room temperature tetragonal structure, analysis of the low temperature spin waves under the assumption of a Heisenberg Hamiltonian indicates strong in-plane anisotropy with a significant next-near neighbor interaction. In the superconducting state, a resonance, localized in both wavevector and energy is observed in the spin excitation spectrum as in the cuprates. This resonance is observed at a wavevector compatible with a Fermi surface nesting instability independent of the magnetic ordering of the relevant parent compound. The resonance energy (Er) scales with superconducting transition temperature (TC) as Er ~4.9 kBTC consistent with the canonical value of ~5 kBTC observed in the cuprates. Moreover, the relationship between the resonance energy and the superconducting gap, Δ, is similar to that observed in many unconventional superconductors (Er/2Δ~ 0.64).

To be published as a topical review for Journal of Physics: Condensed Matter (13 figures)

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Cited by in corpus (18)

• High-temperature superconductivity in iron-based materials
• Unified Picture for Magnetic Correlations in Iron-Based Superconductors
• Symmetry of spin excitation spectra in the tetragonal paramagnetic and superconducting phases of 122-ferropnictides
• Spin fluctuations in LiFeAs observed by neutron scattering
• Itinerant Spin Excitations in SrFe2As2 Measured by Inelastic Neutron Scattering
• Neutron and ARPES Constraints on the Couplings of the Multiorbital Hubbard Model for the Pnictides
• Competing magnetic ground states in non-superconducting Ba(Fe1-xCrx)2As2
• Magnetic ordering in mackinawite (tetragonal FeS): evidence for strong itinerant spin fluctuations
• The upper critical field and its anisotropy in LiFeAs
• Nd induced Mn spin-reorientation transition in NdMnAsO
• Two energy scales in the magnetic resonance spectrum of electron and hole doped pnictide superconductors
• Magnetic order in orbital models of the iron pnictides
• Antiferromagnetic spin excitations in single crystals of nonsuperconducting Li1-xFeAs
• Spin and Orbital Characters of Excitations in Iron Arsenide Superconductors Revealed by Simulated Fe L-Edge RIXS
• Theoretical Investigation of Optical Conductivity in Ba [Fe(1-x)Co(x)]2 As2
• Commensurate antiferromagnetic ordering in Ba(Fe{1-x}Co{x})2As2 determined by x-ray resonant magnetic scattering at the Fe K-edge
• Temperature dependent local structure of NdFeAsO1-xFx system using arsenic K-edge extended x-ray absorption fine structure
• Magneto-structural coupling and harmonic lattice dynamics in CaFe${}_2$As${}_2$ probed by Mössbauer spectroscopy