Tunneling spectroscopy for probing orbital anisotropy in iron pnictides

Abstract

Using realistic multi-orbital tight-binding Hamiltonians and the T-matrix formalism, we explore the effects of a non-magnetic impurity on the local density of states in Fe-based compounds. We show that scanning tunneling spectroscopy (STS) has very specific anisotropic signatures that track the evolution of orbital splitting (OS) and antiferromagnetic gaps. Both anisotropies exhibit two patterns that split in energy with decreasing temperature, but for OS these two patterns map onto each other under 90 degree rotation. STS experiments that observe these signatures should expose the underlying magnetic and orbital order as a function of temperature across various phase transitions.

12 pages, 9 figures, replacement with minor changes suggested by referees

References in corpus (34)

• 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${}_x$}
• Evidence for an electron nematic phase transition in underdoped iron pnictide superconductors
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Strong Correlations and Magnetic Frustration in the High Tc Iron Pnictides
• Theory of Electron Nematic Order in LaOFeAs
• Origin of the ~150 K Anomaly in LaOFeAs; Competing Antiferromagnetic Superexchange Interactions, Frustration, and Structural Phase Transition
• Correlated electronic structure of LaOFeAs
• Ising and Spin orders in Iron-based Superconductors
• Funtional Renormalization Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs Based High Temperature Superconductors
• Nematic and meta-nematic transitions in the iron pnictides
• Pairing Symmetry in a Two-Orbital Exchange Coupling Model of Oxypnictides
• Spin-orbital frustrations and anomalous metallic state in iron-pnictide superconductors
• Multiband magnetism and superconductivity in Fe-based compounds
• Electron-Hole Symmetry and Magnetic Coupling in Antiferromagnetic LaOFeAs
• Orbital Order and Spontaneous Orthorhombicity in Iron Pnictides
• Anisotropic Impurity-States, Quasiparticle Scattering and Nematic Transport in Underdoped Ca(Fe1-xCox)2As2
• Antiferromagnetically Driven Electronic Correlation in Iron Pnictides and Cuprates
• Anisotropy, Itineracy, and Magnetic Frustration in High-Tc Iron Pnictides
• Orbital Fluctuation Theory in Iron Pnictides: Effects of As-Fe-As Bond Angle, Isotope Substitution, and $Z^2$-Orbital Pocket on the Superconductivity
• Theory of itinerant magnetic excitations in the SDW phase of iron-based superconductors
• Experimental Consequences of the S-wave $\cos (k_x)\cdot \cos (k_y)$ Superconductivity in the Iron-Pnictides
• Theory for Superconductivity in Iron Pnictides at Large Coulomb U Limit
• Low magnetization and anisotropy in the antiferromagnetic state of undoped iron pnictides
• Orbital-weight redistribution triggered by spin order in the pnictides
• A momentum-dependent perspective on quasiparticle interference in Bi_{2}Sr_{2}CaCu_{2}O_{8+δ}
• Effects of cobalt doping and three-dimensionality in $BaF{e}_{2}A{s}_2$
• Excitonic spin density wave state in iron pnictides
• Multiorbital Effects on Antiferromagnetism in Fe Pnictides
• Anisotropic electrical resistivity of LaFeAsO: evidence for electronic nematicity
• Quasiparticle interference in antiferromagnetic parent compounds of Fe-based superconductors
• Dimer Impurity Scattering, "Reconstructed" Nesting and Density-Wave Diagnostics in Iron Pnictides
• Impurity states in antiferromagnetic Iron Arsenides
• Breaking of four-fold lattice symmetry in a model for pnictide superconductors

Cited by in corpus (11)

• Dynamic competition between spin density wave order and superconductivity in underdoped $B{a}_{1-x}{K}_{x}F{e}_{2}A{s}_2$
• Emergent defect states as a source of resistivity anisotropy in the nematic phase of iron pnictides
• Detailed band structure of twinned and detwinned BaFe${}_2$As${}_2$ studied with angle-resolved photoemission spectroscopy
• Direct characterization of photo-induced lattice dynamics in BaFe2As2
• Evidence for Orbital Order and its Relation to Superconductivity in FeSe0.4Te0.6
• Antiferromagnetism in Iron-Based Superconductors: Selection of Magnetic Order and Quasiparticle Interference
• Quasi-one Dimensional Nanostructures as Sign of Nematicity in Iron Pnictides and Chalcogenides
• Highly anisotropic quasiparticle interference patterns in the spin-density wave state of the iron pnictides
• Quasiparticle scattering interference in iron pnictides: A probe of the origin of nematicity
• Atomic-scale imaging of electronic nematicity in ferropnictides
• Magneto-orbital coupling in iron pnictides