Local Quantum Criticality of an Iron-Pnictide Tetrahedron

Abstract

Motivated by the close correlation between transition temperature ($T_c$) and the tetrahedral bond angle of the As-Fe-As layer observed in the iron-based superconductors, we study the interplay between spin and orbital physics of an isolated iron-arsenide tetrahedron embedded in a metallic environment. Whereas the spin Kondo effect is suppressed to low temperatures by Hund's coupling, the orbital degrees of freedom are expected to quantum mechanically quench at high temperatures, giving rise to an overscreened, non-Fermi liquid ground-state. Translated into a dense environment, this critical state may play an important role in the superconductivity of these materials.

References in corpus (12)

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• Strong Correlations and Magnetic Frustration in the High Tc Iron Pnictides
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• Correlated electronic structure of LaOFeAs
• Magnetism and Charge Dynamics in Iron Pnictides
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• Spin freezing transition and non-Fermi-liquid self-energy in a 3-orbital model
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• Neutron Studies of the Iron-based Family of High TC Magnetic Superconductors
• Kondo resonance narrowing in d- and f-electron systems
• Nodal gap structure of BaFe_2(As_{1-x}P_x)_2 from angle-resolved thermal conductivity in a magnetic field
• Anisotropic Superconducting Properties of Optimally Doped BaFe${}_2$(As${}_{0.65}$P${}_{0.35}$)${}_2$ under Pressure

Cited by in corpus (11)

• Strong electronic correlations from Hund's coupling
• Fractional power-law behavior and its origin in iron-chalcogenide and ruthenate superconductors: Insights from first-principles calculations
• Quantum criticality in AFe2As2 with A = K, Rb, and Cs suppresses superconductivity
• Competing collinear magnetic structures in superconducting FeSe by first principles quantum Monte Carlo calculations
• Low quasiparticle coherence temperature in the one band-Hubbard model: A slave-boson approach
• Orbital-selective bad metals due to Hund's rule and orbital anisotropy: a finite-temperature slave-spin treatment of the two-band Hubbard model
• An analytically tractable model of bad metals
• Quantum Criticality Enabled by Intertwined Degrees of Freedom
• Entropy and specific heat of the infinite-dimensional three-orbital Hubbard model
• Strong local moment antiferromagnetic spin fluctuations in V-doped LiFeAs
• Electronic Structure Reconstruction across the Antiferromagnetic Transition in TaFe${}_{1.23}$Te${}_3$ Spin Ladder