Magnetic order in BaFe2As2, the parent compound of the FeAs based superconductors in a new structural family

Abstract

In addition to higher Tc compared with the ubiquitous cuprates for a material composed of a single electronically active layer, the newly discovered LnFeAsO superconductors offer additional compositional variation. In a similar fashion to the CuO2 layers in cuprates, the FeAs layers now dominate the electronic states that produce superconductivity. Cuprate superconductors distinguish themselves structurally by adopting different stacking of the Cu-O and electronically inactive "spacer" layers. Using the same structural philosophy, materials with the formula (A,K)Fe2As2,A=Ba or Sr have been reported and possess a Tc~38 K. Here, we report the neutron diffraction studies of BaFe2As2 that shows, in contrast to previous studies on the LnFeAsO materials, an antiferromagnetic transition which concurs with first-order structural transition. Although the magnetic and structural transitions occur differently in the AFe2As2 and LnFeAsO-type materials, this work clearly demonstrates that the complete evolution to a low symmetry structure is a pre-requirement for the magnetic order.

arXiv comment16 pages, 4 figures, 1 table

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• Tuning electronic correlations in transition metal pnictides: chemistry beyond the valence count
• Angle-resolved photoemission spectroscopy study on iron-based superconductors
• Strong electronic correlations in iron pnictides: Comparison of the optical spectra for BaFe2As2-related compounds
• Angle-resolved photoemission spectroscopy study of PrFeAsO_{0.7}: Dependence of the electronic structure on the pnictogen height
• Three dimensional generalization of the $J_1$-$J_2$ Heisenberg model on a square lattice and role of the interlayer coupling $J_c$
• Cooperative effects of Coulomb and electron-phonon interactions in the two-dimensional 16-band d-p model for iron-based superconductors
• Uniaxial pressure effect on the magnetic ordered moment and transition temperatures in BaFe${}_{2-x}{T}_x$As${}_2$ ($T=$Co, Ni)
• Local and collective magnetism of EuFe${}_2$As${}_2$
• Transport and pinning properties of Ag-doped FeSe0.94
• Effects of Lifshitz Transition on Charge Transport in Magnetic Phases of Fe-Based Superconductors
• Strong ferromagnetic exchange interaction in the parent state of the superconductivity in BaFe${}_2$S${}_3$
• Impurity-induced quasiparticle interference in the parent compounds of iron-pnictide superconductors
• Incommensurate spin-density wave and magnetic lock-in transition in CaFe4As3
• Strong coupling to magnetic fluctuations in the charge dynamics of Fe-based superconductors
• Temperature and Pressure Dependence of the Fe-specific Phonon Density of States in Ba(Fe(1-x)Co(x))2As2
• Anomalous Meissner effect in pnictide superconductors
• ARPES observation of Mn-pnictide hybridization and negligible band structure renormalization in BaMn${}_2$As${}_2$ and BaMn${}_2$Sb${}_2$
• First-principles investigation of effect of pressure on BaFe${}_2$As${}_2$
• Spin-Density-Wave Gap with Dirac Nodes and Two-Magnon Raman Scattering in BaFe2As2
• Orbital Symmetry of Ba(Fe1-xCox)2As2 Superconductors Probed with X-ray Absorption Spectroscopy
• Local structural variation as source of magnetic moment reduction in BaFe2As2
• Magnetic Lattice Dynamics of the Oxygen-Free FeAs Pnictides: How Sensitive are Phonons to Magnetic Ordering?
• Imaging Nematic Transitions in Iron-Pnictide Superconductors with a Quantum Gas
• Critical Slowing Down of Quadrupole and Hexadecapole Orderings in Iron Pnictide Superconductor
• Coexistence of superconductivity and magnetism in CaK(Fe${}_{1-x}$Ni${}_x$)${}_4$As${}_4$ as probed by ${}^{57}$Fe Mössbauer spectroscopy
• Half-metallic Antiferromagnet BaCrFeAs2
• Crystal growth and the electronic phase diagram of the 4$d$ doped Na${}_{1-\delta }$Fe${}_{1-x}$Rh${}_x$As in comparison with 3$d$ doped Na${}_{1-\delta }$Fe${}_{1-x}$Co${}_x$As
• Critical Behavior of the SDW Transition in Underdoped Ba(Fe1-xCox)2As2 (x <=0.05): 75As NMR Investigation
• Structure and magnetic properties of {\it Ln}MnSbO ({\it Ln} = La and Ce) and CeMnAsO
• Magnetism and Mott Transition: A Slave-rotor Study
• Bicollinear Antiferromagnetic Order, Monoclinic Distortion, and Reversed Resistivity Anisotropy in FeTe as a Result of Spin-Lattice Coupling
• Novel Insulating Magnetism in Vacancy-Ordered K2Fe4Se5
• Muon-spin rotation measurements of the magnetic penetration depth in the Fe-based superconductor Ba_(1-x)Rb_(x)Fe2As2
• The Phase Transition of Square Lattice Antiferromagnets at Finite Temperature
• Magnetic scattering and electron pair breaking by rare-earth-ion substitution in BaFe2As2 epitaxial films
• Electron doping evolution of the magnetic excitations in NaFe${}_{1-x}$Co${}_x$As
• Magnetism and superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Evolution from $B_{2g}$ nematics to $B_{1g}$ nematics in heavily hole-doped iron-based superconductors
• Theoretical Investigation of Optical Conductivity in Ba [Fe(1-x)Co(x)]2 As2
• Heavily Hydride-ion-doped 1111-type Iron-based Superconductors: Synthesis, Physical Properties and Electronic Structure
• Inelastic Neutron Scattering Studies of the Spin and Lattice Dynamics in Iron Arsenide Compounds
• Effect of magnetism on lattice dynamics in SrFe${}_2$As${}_2$ as seen via high resolution inelastic x-ray scattering
• Spin anisotropy due to spin-orbit coupling in optimally hole-doped Ba${}_{0.67}$K${}_{0.33}$Fe${}_2$As${}_2$
• Two spatially separated phases in semiconducting Rb${}_{0.8}$Fe${}_{1.5}$S${}_2$
• Origin of structural and magnetic transitions in BaFe${}_{2-x}$Ru${}_x$As${}_2$ materials
• Nanoscale textured superconductivity in Ru-substituted BaFe2As2 : a challenge to a universal phase diagram for the pnictides
• First-principles evidence of Mn moment canting in hole-doped Ba${}_{1-2x}$K${}_{2x}$Mn${}_2$As${}_2$
• Diverse fluctuations and anisotropic Gr{\" u}neisen parameter behavior in iron-based superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ and their correlation with superconductivity
• Tuning magnetism in FeAs-based materials via tetrahedral structure
• Orbital density wave induced by electron-lattice coupling in orthorhombic iron pnictides
• Antiferromagnetic Critical Fluctuations in BaFe${}_2$As${}_2$
• Magnetism and superconductivity in the layered hexagonal transition metal pnictides
• Group theory of Wannier functions providing the basis for a deeper understanding of magnetism and superconductivity
• Quantum oscillations of the superconductor LaRu${}_2$P${}_2$ : comparable mass enhancement $\lambda \approx 1$ in Ru and Fe phosphides
• Probing the Ground State Properties of Iron-based Superconducting Pnictides and Related Systems by Muon-Spin Spectroscopy
• Commensurate antiferromagnetic ordering in Ba(Fe{1-x}Co{x})2As2 determined by x-ray resonant magnetic scattering at the Fe K-edge
• In-plane uniaxial pressure-induced out-of-plane antiferromagnetic moment and critical fluctuations in BaFe${}_2$As${}_2$
• Unidirectional Electronic Structure in the Parent State of Iron-Chalcogenide Superconductor Fe${}_{1+\delta }$Te
• Prediction of orbital selective Mott phases and block magnetic states in the quasi-one-dimensional iron chain Ce${}_2$O${}_2$FeSe${}_2$ under hole and electron doping
• Evidence for Local Moment by Electron Spin Resonance Study on Polycrystalline LaFeAsO${}_{1-x}$F${}_x$ (x=0 and 0.13)
• Intertwined spin-orbital coupled orders in the iron-based superconductors
• Thermal evolution of antiferromagnetic correlations and tetrahedral bond angles in superconducting FeTe${}_{1-x}$Se${}_x$
• Orbital-selective spin waves in detwinned NaFeAs
• Emergent Phases of Nodeless and Nodal Superconductivity Separated by Antiferromagnetic Order in Iron-based Superconductor (Ca4Al2O6)Fe2(As1-xPx)2: 75As- and 31P-NMR Studies
• Energy scale of nematic ordering in the parent iron-based superconductor:BaFe2As2
• Controlling T${}_c$ through band structure and correlation engineering in collapsed and uncollapsed phases of iron arsenides
• Common origin of the two types of magnetic fluctuations in iron chalcogenides
• Magnetic phase diagram in Eu${}_{1-x}$La${}_x$Fe${}_2$As${}_2$ single crystals
• Anisotropic thermal expansion of AEFe2As2 (AE = Ba, Sr, Ca) single crystals
• Magnetic neutron diffraction study of Ba(Fe1-xCox)2As2 critical exponents through the tricritical doping
• Disorder-dependent superconducting phase-diagram at high magnetic fields in Fe${}_{1+y}$Se${}_x$Te${}_{1-x}$ ($x\sim 0.4$)
• Striped antiferromagnetic order and electronic properties of stoichiometric LiFeAs from first-principles calculations
• BaFe2As2 Surface Domains and Domain Walls: Mirroring the Bulk Spin Structure
• Intertwined magnetic and nematic orders in semiconducting KFe${}_{0.8}$Ag${}_{1.2}$Te${}_2$
• Coexistence of superconductivity and magnetism in K0.8Fe2Se1.4S0.4
• Ru-doping on iron based pnictides: the "unfolded" dominant role of structural effects for superconductivity
• Magnetism and superconductivity in Sr${}_2$VFeAsO${}_3$ revealed by ${}^{75}$As- and ${}^{51}$V-NMR under elevated pressures
• Is BaCr${}_2$As${}_2$ symmetrical to BaFe${}_2$As${}_2$ with respect to half $3d$ shell filling?
• Effects of Vanadium doping on BaFe2As2
• Hidden phase in parent Fe-pnictide superconductors
• Spin dynamics near a putative antiferromagnetic quantum critical point in Cu substituted BaFe${}_2$As${}_2$ and its relation to high-temperature superconductivity
• Robust antiferromagnetic spin waves across the metal-insulator transition in hole-doped BaMn${}_2$As${}_2$
• Magnetic moment evolution and spin freezing in doped BaFe${}_2$As${}_2$
• Magnetothermoelectric effects in Fe{1+d}Te{1-x}Se{x}
• SDW transition of Fe1 zigzag chains and metamagnetic transition of Fe2 in TaFe${}_{1+y}$Te${}_3$
• Doping evolution of antiferromagnetism and transport properties in the non-superconducting BaFe2-2xNixCrxAs2
• Reversed anisotropy of the in-plane resistivity in the antiferromagnetic phase of iron tellurides
• Probing the pairing symmetry in the over-doped Fe-based superconductor Ba_0.35Rb_0.65Fe_2As_2 as a function of hydrostatic pressure
• Momentum-resolved measurement of electronic nematic susceptibility in the FeSe${}_{0.9}$S${}_{0.1}$ superconductor
• The interplay between magnetism, structure, and strong electron-phonon coupling in binary FeAs under pressure
• The double life of electrons in magnetic iron pnictides, as revealed by NMR
• Review of nuclear magnetic resonance studies on iron-based superconductors
• Scanning tunneling microscopy of the 32 K superconductor (Sr1-xKx)Fe2As2
• Orbital-Selective Superconductivity and the Effect of Lattice Distortion in Iron-Based Superconductors
• Disentangling superconducting and magnetic orders in NaFe_1-xNi_xAs using muon spin rotation
• Giant Anisotropic Magnetoresistance due to Purely Orbital Rearrangement in the Quadrupolar Heavy Fermion Superconductor PrV${}_2$Al${}_{20}$
• Brief review on iron-based superconductors: are there clues for unconventional superconductivity?
• Nematicity of correlated systems driven by anisotropic chemical phase separation
• Physics picture from neutron scattering study on Fe-based superconductors
• Possible Bicollinear Nematic State with Monoclinic Lattice Distortions in Iron Telluride Compounds
• Plaquette instability competing with bicollinear ground state in detwinned FeTe
• Memory function approach to in-plane anisotropic resistivity in the antiferromagnetic phase of iron arsenide superconductors
• Comparative study on the thermoelectric effect of parent oxypnictides La$T$AsO ($T$ = Fe, Ni)
• Correlation Effects on Antiferromagnetism in Fe Pnictides
• Temperature-induced Change in the Fermi Surface Topology in the Spin Density Wave Phase of Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Exploration of iron-chalcogenide superconductors
• Thermodynamic electric quadrupole moments of nematic phases from first-principles calculation
• Low-temperature thermal conductivity of BaFe2As2: Parent compound of iron-arsenide superconductors
• A Finite-temperature First-principles Approach to Spin Fluctuation in BaFe_2As_2
• CuFeAs: A New Member in the 111-Family of Iron-Pnictides
• Doping dependence of antiferromagnetism in models of the pnictides
• A Three-Dimensional Tight-Binding Model and Magnetic Instability of KFe2e2
• Observation of isosceles triangular electronic structure around excess iron atoms in Fe${}_{1+\delta }$Te
• High resolution x-ray scattering studies of structural phase transitions in Cr-doped BaFe2As2
• Magnetic neutron scattering studies on the Fe-based superconductor system Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Doping effects of Cr on the physical properties of BaFe${}_{1.9-x}$Ni${}_{0.1}$Cr${}_x$As${}_2$
• Lifshitz Transitions in 122-Pnictides Under Pressure
• Local breaking of four-fold rotational symmetry by short-range magnetic order in heavily overdoped Ba(Fe${}_{1-x}$Cu${}_x$)${}_2$As${}_2$
• Spin excitation anisotropy in the paramagnetic tetragonal phase of BaFe2 As2
• Magnetisation distribution in the tetragonal phase of BaFe2As2
• Anomalous spectral weight transfer in the nematic state of iron-selenide superconductor
• Anomalous Dome-like Superconductivity in RE2(Cu1-xNix)5As3O2(RE=La, Pr, Nd)
• Magnetically polarized Ir dopant atoms in superconducting Ba(Fe${}_{1-x}$Ir${}_x$)${}_2$As${}_2$
• Competing superconducting and magnetic order parameters and field-induced magnetism in electron doped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Ultralow-dissipative conductivity by Dirac fermions in BaFe${}_2$As${}_2$
• Structural phase diagram of LaO1-xFxBiSSe: suppression of the structural phase transition by partial F substitutions
• Role of Sn impurity on electronic topological transitions in 122 Fe-based superconductors
• Monoclinic LaSb${}_2$ Superconducting Thin Films
• Fermi surfaces and Phase Stability of Ba(Fe${}_{1-x}$M${}_x$)${}_2$As${}_2$ (M=Co, Ni, Cu, Zn)
• Nematic state stabilized by off-site Coulomb interaction in iron-based superconductors
• Two-Fluid Description for Iron-Based Superconductors
• Theoretical investigation of the electronic and magnetic properties of the orthorhombic phase of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Finite temperature and pressure molecular dynamics for BaFe2As2
• Upper Critical Fields and Anisotropy of Ca1-xLaxFe2As2 Single Crystals
• Effect of electron correlations on spin excitation bandwidth in Ba${}_{0.75}$K${}_{0.25}$Fe${}_2$As${}_2$ as seen via time-of-flight inelastic neutron scattering
• Theoretical study on the anisotropic electronic structure of antiferromagnetic BaFe${}_2$As${}_2$ and Co-doped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ seen by angle-resolved photoemission
• Importance of Itinerancy and Quantum Fluctuations for the Magnetism in Iron Pnictides
• Spin-isotropic continuum of spin excitations in antiferromagnetically ordered Fe${}_{1.07}$Te
• Single-crystal growth of iron-based superconductor La${}_{0.34}$Na${}_{0.66}$Fe${}_2$As${}_2$
• Strain-induced spin-nematic state and nematic susceptibility arising from $2\times 2$ Fe clusters in KFe${}_{0.8}$Ag${}_{1.2}$Te${}_2$
• Impact of the first order antiferromagnetic phase transition on the paramagnetic spin excitations and nematic phase of SrFe${}_2$As${}_2$
• Structural Distortion Stabilizing the Antiferromagnetic and Semiconducting Ground State of BaMn${}_2$As${}_2$
• Fermi-surface reconstruction involving two Van Hove singularities across the antiferromagnetic transition in BaFe2As2
• Evidence for polarons in iron pnictides of the Ln-1111 and AE-122 families
• A direct probe of the variability of Coulomb correlation in Fe-pnictide superconductors
• Zigzag chain structure transition and orbital fluctuations in Ni-based superconductors
• Effect of Fermi Surface Topology on Inter-Layer Magnetoresistance in Layered Multiband Systems: Application to LaFeAsO1-xFx
• Magnetic Properties of RFe2Si2 and R(Fe1-xMx)2Si2 Systems (R=La, Y and Lu, M= Ni, Mn and Cu)
• Magneto-elastic coupling in Fe-based superconductors
• Suppression of $T_c$ by Zn impurity in the electron-type LaFe${}_{0.925-y}$Co${}_{0.075}$Zn${}_y$AsO system
• Study of the hyperfine fields in the BaFe${}_2$As${}_2$ family and its relation to the magnetic moment
• Doping dependence and electron-boson coupling in the ultrafast relaxation of hot electron populations in Ba(Fe_{1-x}Co_x)_2As_2
• Stronger quantum fluctuation with larger spins: Emergent magnetism in the pressurized high-temperature superconductor FeSe
• Non-rigid band shift and non-monotonic electronic structure changes upon doping in the normal state of the pnictide high temperature superconductor Ba2(Fe1-xCox)2As2
• Uniaxial $c$-axis pressure effects on underdoped BaFe${}_2$(As${}_{0.72}$P${}_{0.28}$)${}_2$ superconductor
• Common ($\pi$,$\pi$) Band Folding and Surface Reconstruction in FeAs-Based Superconductors
• Controllable magnetic anisotropy and ferroelasticity in superconducting FeSe monolayer with surface fluorine adsorption
• A Single-Crystal Neutron Diffraction Study on Magnetic Structure of CsCo2Se2
• Pressure-driven phase transitions in correlated systems
• Mössbauer studies of spin- and charge-modulations in BaFe2(As1-xPx)2
• Evolution of superconductivity and antiferromagnetic order in Ba(Fe${}_{0.92-x}$Co${}_{0.08}$V${}_x$)${}_2$As${}_2$
• c-axis pressure induced antiferromagnetic order in optimally P-doped BaFe2(As0.70P0.30)2 superconductor
• Effect of the iron valence in the two types of layers in LiFeO${}_2$Fe${}_2$Se${}_2$
• Quantum Oscillations in EuFe2As2 single crystals
• A neutron scattering study of the under-doped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$, x=0.09 and 0.17 self-flux grown single crystals and the universality of the tricritical point
• Persistent Magnetism in Silver-doped BaFe2As2 Crystals
• Metallicity of Ca2Cu6P5 with Single and Double Copper-Pnictide Layers
• Breakdown of the Hund's Rule in CuFeAs
• Spin-wave excitations in the SDW state of iron pnictides: a comparison between the roles of interaction parameters
• Magnetic softness in iron-based superconductors
• Neutron powder diffraction study on the non-superconducting phases of ThFeAsN${}_{1-x}$O${}_x$ ($x=0.15,0.6$) iron pnictide
• Paramagnetic spin excitations in insulating Rb${}_{0.8}$Fe${}_{1.6}$Se${}_2$
• Interplay of iron and rare-earth magnetic order in rare-earth iron pnictide superconductors under magnetic field
• Uncovering double-stripe and plaquette antiferromagnetic states in the one-band Hubbard model on a frustrated square lattice
• Linear scaling relation between two-dimensional massless Dirac fermion Fermi velocity and Fe-As bond length in iron arsenide superconductor systems
• Quantitative relationship between structural orthorhombicity, shear modulus and heat capacity anomaly of the nematic transition in iron-based superconductors
• Strain-activated structural anisotropy in BaFe2As2
• Low-energy, planar magnetic defects in BaFe2As2: nanotwins, twins, antiphase and domain boundaries
• Electronic Phase Propagation Speed in BaFe${}_2$As${}_2$ Revealed by Dilatometry
• Orbital-selective electronic excitations in iron arsenides revealed by simulated nonresonant inelastic x-ray scattering
• Spin-wave excitations in the SDW state of doped iron pnictides
• Structural and antiferromagnetic properties of Ba(Fe${}_{1-x-y}$Co${}_x$Rh${}_y$)${}_2$As${}_2$ compounds
• The influence of the structural transition on magnetic fluctuations in NaFeAs
• Temperature-dependent local structure of superconducting BaPd${}_2$As${}_2$ and SrPd${}_2$As${}_2$
• An improved particle swarm optimization algorithm and its application to search for new magnetic ground states in the Hubbard model
• Multiple superconducting gap and anisotropic spin fluctuations in iron arsenides: Comparison with nickel analog
• Magnetic form factor analysis on detwinned single crystal of BaFe${}_2$As${}_2$
• Quantum oscillations and transport properties of layered single-crystal SrCu${}_4$As${}_2$
• Anisotropic Thermal Transport in Superconductors with Coexisting Spin Density Waves
• Lattice expansion from isotope substitution in the Iron based superconductors
• Phase diagram of the isovalent phosphorous-substituted 122-type iron pnictides
• Decoupling of Lattice and Orbital Degrees of Freedom in an Iron-Pnictide Superconductor
• Protracted Kondo coherence with dilute carrier density in Cerium based nickel pnictides
• Lattice Disorder Effect on Magnetic Ordering of Iron Arsenides
• The hybrid lattice of KxFe2-ySe2: why superconductivity and magnetism can coexist
• Magnetism and Superconductivity in Iron-based Superconductors Decided by Condensed Particle-hole Excitations away from the Fermi Level
• Three-dimensional spin susceptibility in Ba${}_{0.75}$K${}_{0.25}$Fe${}_2$As${}_2$: Out-of-plane modulation revealed by neutron spectroscopy and theoretical modeling
• Local-moment magnetism in Mn-based pnictides
• Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe${}_{0.875}$Ti${}_{0.125}$)${}_2$As${}_2$
• Magnetic properties of iron pnictides from spin-spiral calculations
• Antiferromagnetic structure and magnetic properties of Dy2O2Te: An isostructural analog of the rare-earth superconductors R2O2Bi