Spin reorientation driven by the interplay between spin-orbit coupling and Hund's rule coupling in iron pnictides

Abstract

In most magnetically-ordered iron pnictides, the magnetic moments lie in the FeAs planes, parallel to the modulation direction of the spin stripes. However, recent experiments in hole-doped iron pnictides have observed a reorientation of the magnetic moments from in-plane to out-of-plane. Interestingly, this reorientation is accompanied by a change in the magnetic ground state from a stripe antiferromagnet to a tetragonal non-uniform magnetic configuration. Motivated by these recent observations, here we investigate the origin of the spin anisotropy in iron pnictides using an itinerant microscopic electronic model that respects all the symmetry properties of a single FeAs plane. We find that the interplay between the spin-orbit coupling and the Hund's rule coupling can account for the observed spin anisotropies, including the spin reorientation in hole-doped pnictides, without the need to invoke orbital or nematic order. Our calculations also reveal an asymmetry between the magnetic ground states of electron- and hole-doped compounds, with only the latter displaying tetragonal magnetic states.

16 pages, 13 figures

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• Ironing out the details of unconventional superconductivity
• Low-energy microscopic models for iron-based superconductors: a review
• Double-Q spin-density wave in iron arsenide superconductors
• Hedgehog spin-vortex crystal stabilized in a hole-doped iron-based superconductor
• Spin-orbit phase behaviors of Na2Co2TeO6 at low temperatures
• Complex phase diagram of Ba${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$: a multitude of phases striving for the electronic entropy
• Vestigial chiral and charge orders from bidirectional spin-density waves: Application to the iron-based superconductors
• Uniaxial strain control of spin-polarization in multicomponent nematic order of BaFe${}_2$As${}_2$
• Prominent role of spin-orbit coupling in FeSe
• Dichotomy between in-plane magnetic susceptibility and resistivity anisotropies in extremely strained $BaF{e}_{2}A{s}_2$
• Disorder-promoted $C_4$-symmetric magnetic order in iron-based superconductors
• Antiferromagnetic order in CaK(Fe[1-x]Ni[x])4As4 and its interplay with superconductivity
• Orbital mismatch boosting nematic instability in iron-based superconductors
• Topological Superconductivity Induced by Magnetic Texture Crystals
• Unravelling incommensurate magnetism and its emergence in iron-based superconductors
• Spin-Orbital-Intertwined Nematic State in FeSe
• Emergent magnetic degeneracy in iron pnictides due to the interplay between spin-orbit coupling and quantum fluctuations
• Role of multiorbital effects in the magnetic phase diagram of iron-pnictides
• Pressure induced magnetic order in FeSe
• Singular magnetic anisotropy in the nematic phase of FeSe
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• Spin anisotropy due to spin-orbit coupling in optimally hole-doped Ba${}_{0.67}$K${}_{0.33}$Fe${}_2$As${}_2$
• NMR study of nematic spin fluctuations in a detwinned single crystal of underdoped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Order parameter fluctuation and ordering competition in $\mathrm{B}{\mathrm{a}}_{1-\mathrm{x}}{\mathrm{K}}_{\mathrm{x}}\mathrm{F}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$
• Intertwined spin-orbital coupled orders in the iron-based superconductors
• Orbital transmutation and the electronic spectrum of FeSe in the nematic phase
• Magnetic phase diagram of the iron pnictides in the presence of spin-orbit coupling: Frustration between $C_2$ and $C_4$ magnetic phases
• Collective magnetic excitations of $C_4$ symmetric magnetic states in iron-based superconductors
• Anomalous Composition-Induced Crossover in the Magnetic Properties of the Itinerant-Electron Antiferromagnet Ca{1-x}Sr{x}Co{2-y}As{2}
• Competing Electronic Phases near the Onset of Superconductivity in Hole-doped SrFe2As2
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• Muon spin rotation and infrared spectroscopy study of $B{a}_{1-x}N{a}_{x}F{e}_{2}A{s}_2$
• Scanning tunneling spectroscopy as a probe of multi-Q magnetic states of itinerant magnets
• Orbital loop currents in iron-based superconductors
• Antiferromagnetic chiral spin density wave and strain-induced Chern insulator in the square lattice Hubbard model with frustration
• Raman scattering study of tetragonal magnetic phase in Sr${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$: structural symmetry and electronic gap
• Odd-frequency Pairing in the Edge States of Superconducting Pnictides in the Coexistence Phase with Antiferromagnetism
• Random-strain-induced correlations in materials with intertwined nematic and magnetic orders
• Effect of nonsymmorphic space group on correlation functions in iron-based superconductors
• Odd-Parity Magnetism in Fe-Based Superconductors
• Anisotropic superconductivity and Fermi surface reconstruction in the spin-vortex antiferromagnetic superconductor CaK(Fe${}_{0.95}$Ni${}_{0.05}$)${}_4$As${}_4$
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