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.

16 pages, 4 figures, 1 table

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• Coexistence of the spin-density-wave and superconductivity in the (Ba,K)Fe2As2
• Superconductivity up to 30 K in the vicinity of quantum critical point in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
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• Superconductivity induced by Ni doping in BaFe${}_2$As${}_2$
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• Structural and magnetic phase transitions in the ternary iron arsenides SrFe2As2 and EuFe2As2
• Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6
• (pi,pi)-electronic order in iron arsenide superconductors
• Iron pnictides as a new setting for quantum criticality
• Three-dimensional Resonance in superconducting BaFe${}_{1.9}$Ni${}_{0.1}$As${}_2$
• A neutron scattering study of the interplay between structure and magnetism in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Lattice collapse and quenching of magnetism in CaFe2As2 under pressure: A single crystal neutron and x-ray diffraction investigation
• Anisotropic itinerant magnetism and spin fluctuations in BaFe2As2: A neutron scattering study
• Antiferromagnetically Driven Electronic Correlation in Iron Pnictides and Cuprates
• Superconductivity coexisting with phase-separated static magnetic order in (Ba,K)Fe${}_2$As${}_2$, (Sr,Na)Fe${}_2$As${}_2$ and CaFe${}_2$As${}_2$
• Electronic Structure of the BaFe${}_2$As${}_2$ Family of Iron Pnictides
• Neutron diffraction on antiferromagnetic ordering in single-crystal BaFe2As2
• Valley density-wave and multiband superconductivity in Fe-pnictides
• Universal linear-temperature dependence of static magnetic susceptibility in iron-pnictides
• Quantum oscillations in the parent pnictide BaFe${}_2$As${}_2$ : itinerant electrons in the reconstructed state
• Strong-coupling Spin-singlet Superconductivity with Multiple Full Gaps in Hole-doped Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ Probed by Fe-NMR
• Interplay between magnetic properties and Fermi surface nesting in iron pnictides
• Classification of the electronic correlation strength in the Fe-pnictides: The case of the parent compound BaFe2As2
• Water-induced superconductivity in SrFe2As2
• New iron-based arsenide oxides (Fe2As2)(Sr4M2O6)(M = Sc, Cr)
• Phonon anomalies in pure and underdoped R{1-x}K{x}Fe{2}As{2} (R = Ba, Sr) investigated by Raman light scattering
• Antiferromagnetism of SrFe2As2 studied by Single-Crystal 75As-NMR
• Correlation effects in the iron pnictides
• Short-range incommensurate magnetic order near the superconducting phase boundary in Fe(1+d)Te(1-x)Se(x)
• Microscopic origin of pressure-induced phase transitions in iron-pnictide $AF{e}_{2}A{s}_2$ superconductors: an {ab initio} molecular-dynamics study
• Effects of cobalt doping and three-dimensionality in $BaF{e}_{2}A{s}_2$
• Successive phase transitions under high pressure in FeTe0.92
• Band renormalization and Fermi surface reconstruction in iron-based superconductors
• Electronic structure of BaCu${}_2$As${}_2$ and SrCu${}_2$As${}_2$: sp-band metals
• Excitonic spin density wave state in iron pnictides
• Neutron scattering investigation of the magnetic order in single crystalline BaFe2As2
• Evolution of the bulk properties, structure, magnetic order, and superconductivity with Ni doping in CaFe2-xNixAs2
• Suppression of the structural phase transition and lattice softening in slightly underdoped Ba(1-x)K(x)Fe2As2 with electronic phase separation
• The Electronic Phase Diagram of the Iron-based High Tc Superconductor Ba(Fe(1-x)Co(x))2As2 Under Hydrostatic Pressure (0 < x <0.099)
• Suppression of spin density wave by isoelectronic substitution in PrFe(1-x)Ru(x)AsO
• Electronic and lattice dynamical properties of the iron-based superconductors LiFeAs and NaFeAs
• Multiorbital Effects on Antiferromagnetism in Fe Pnictides
• First-principles investigation of effect of pressure on BaFe${}_2$As${}_2$
• Scanning tunneling microscopy of the 32 K superconductor (Sr1-xKx)Fe2As2
• Effect of Fermi Surface Topology on Inter-Layer Magnetoresistance in Layered Multiband Systems: Application to LaFeAsO1-xFx