Impact of local-moment fluctuations on the magnetic degeneracy of iron arsenide superconductors

Abstract

We investigate the fate of the orthorhombic stripe-type magnetic state (ordering vectors $\left(\pi ,0\right)$/$\left(0,\pi \right)$), observed in most iron-pnictide superconductors, in the presence of localized magnetic moments that tend to form a Neel state (ordering vector $\left(\pi ,\pi \right)$). We show that before long-range Neel order sets in, the coupling between the conduction electrons and the fluctuations of the local moments favors an unusual magnetic state consisting of a coherent superposition of the $\left(\pi ,0\right)$ and $\left(0,\pi \right)$ orders that preserves tetragonal symmetry. The magnetization of this state is non-uniform and induces a simultaneous checkerboard charge order. We discuss signatures of this magnetic configuration on the electronic spectrum and its impact on the superconducting state, showing that its phase space for coexistence with the $s^{+-}$ state is smaller than the stripe-type state. Our results shed light on recent experimental observations on $\mathrm{Ba}(\mathrm{F}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{M}{\mathrm{n}}_{\mathrm{x}}{)}_2\mathrm{A}{\mathrm{s}}_2$ compounds, where the Neel-type local Mn moments interact with the Fe conduction electrons.

expanded version as published in PRB

References in corpus (17)

• High-temperature superconductivity in iron-based materials
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
• Nodal Spin Density Wave and band topology of the FeAs based materials
• Evolution of the optical spectrum with doping in iron pnictides Ba(Fe1-xCox)2As2
• On the multi-orbital band structure and itinerant magnetism of iron-based superconductors
• Electronic structure and Magnetism in BaMn${}_2$As${}_2$ and BaMn${}_2$Sb${}_2$
• Interplay between magnetism and superconductivity in Fe-pnictides
• Competing orders in FeAs layers
• Antiferromagnetic ordering in the absence of a structural distortion in Ba(Fe{1-x}Mn{x})2As2
• Enhancement of $T_c$ by disorder in underdoped iron pnictides
• New Phase Induced by Pressure in the Iron-Arsenide Superconductor K-Ba122
• Suppression of superconductivity by Neel-type magnetic fluctuations in the iron pnictides
• Competition between stripe and checkerboard magnetic instabilities in Mn-doped BaFe2As2
• Pressure decoupled magnetic and structural transitions of the parent compound of iron based 122 superconductors BaFe2As2
• Electronic structure of BaCu${}_2$As${}_2$ and SrCu${}_2$As${}_2$: sp-band metals
• Theory of Valley-Density Wave and Hidden Order in Iron-Pnictides

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• Low-energy microscopic models for iron-based superconductors: a review
• Magnetic interactions in iron superconductors: A review
• Vestigial chiral and charge orders from bidirectional spin-density waves: Application to the iron-based superconductors
• Enhancing magnetic stripe order in iron pnictides by RKKY exchange interactions
• Magnetic order without tetragonal-symmetry-breaking in iron arsenides: microscopic mechanism and spin-wave spectrum
• Disorder-promoted $C_4$-symmetric magnetic order in iron-based superconductors
• Emergent magnetic degeneracy in iron pnictides due to the interplay between spin-orbit coupling and quantum fluctuations
• Magnetic phase diagram of the iron pnictides in the presence of spin-orbit coupling: Frustration between $C_2$ and $C_4$ magnetic phases
• Preferred Spin Excitations in the Bilayer Iron-Based Superconductor CaK(Fe${}_{0.96}$Ni${}_{0.04}$)${}_4$As${}_4$ with Spin-Vortex Crystal Order
• Anisotropic magnetic excitations and incipient Néel order in Ba(Fe${}_{1-x}$Mn${}_x$)${}_2$As${}_2$
• Carrier localization due to local magnetic order induced by magnetic impurities in Ba(Fe${}_{1-x}$TM${}_x$)${}_2$As${}_2$ (TM = Mn and Cr) as seen via optical spectra
• Incoherent electronic band states in Mn-substituted BaFe${}_2$As${}_2$