Tuning magnetism in FeAs-based materials via tetrahedral structure

Abstract

Resistivity, magnetic susceptibility, neutron scattering and x-ray crystallography measurements were used to study the evolution of magnetic order and crystallographic structure in single-crystal samples of the Ba1-xSrxFe2As2 and Sr1-yCayFe2As2 series. A non-monotonic dependence of the magnetic ordering temperature T0 on chemical pressure is compared to the progression of the antiferromagnetic staggered moment, characteristics of the ordering transition and structural parameters to reveal a distinct relationship between the magnetic energy scale and the tetrahedral bond angle, even far above T0. In Sr1-yCayFe2As2, an abrupt drop in T0 precisely at the Ca concentration where the tetrahedral structure approaches the ideal geometry indicates a strong coupling between the orbital bonding structure and the stabilization of magnetic order, providing strong constraints on the nature of magnetism in the iron-arsenide superconducting parent compounds.

4 pages, 4 figures. To appear in Phys. Rev. B Rapid Communications

References in corpus (25)

• Superconductivity in Iron Compounds
• High-temperature superconductivity in iron-based materials
• Magnetic order in BaFe2As2, the parent compound of the FeAs based superconductors in a new structural family
• Structural and magnetic phase diagram of CeFeAsO1-xFx and its relationship to high-temperature superconductivity
• Strong Correlations and Magnetic Frustration in the High Tc Iron Pnictides
• Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO1-y (Ln=La,Nd)
• Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering
• Lattice and magnetic instabilities in CaFe2As2: A single crystal neutron diffraction study
• The Unprecedented Giant Coupling of Fe-spin State and the As-As Hybridization in Iron-Pnictide
• Orbital Order and Spontaneous Orthorhombicity in Iron Pnictides
• Spin and Lattice Structure of Single Crystal SrFe2As2
• Lattice collapse and quenching of magnetism in CaFe2As2 under pressure: A single crystal neutron and x-ray diffraction investigation
• Low energy spin waves and magnetic interactions in SrFe${}_2$As${}_2$
• Itinerant magnetic excitations in antiferromagnetic CaFe2As2
• Structural collapse and superconductivity in rare earth-doped CaFe2As2
• Neutron Studies of the Iron-based Family of High TC Magnetic Superconductors
• Intrinsic Properties of Stoichiometric LaOFeP
• Superconducting and ferromagnetic phases induced by lattice distortions in SrFe2As2
• Magnetic ordering and structural distortion in Ru doped BaFe2As2 single crystals studied by Neutron and X-ray diffraction
• Microscopic origin of pressure-induced phase transitions in iron-pnictide $AF{e}_{2}A{s}_2$ superconductors: an {ab initio} molecular-dynamics study
• Maximizing Fermi surface multiplicity optimizes superconductivity in iron pnictides
• The suppression of magnetism and the development of superconductivity within the collapsed tetragonal phase of Ca0.67Sr0.33Fe2As2 at high pressure
• Low ordered magnetic moment by off-diagonal frustration in undoped parent compounds to iron-based high-Tc superconductors
• Antiferromagnetic Critical Fluctuations in BaFe${}_2$As${}_2$
• Uniform chemical pressure effect in solid solutions Ba(1-x)Sr(x)Fe2As2 and Sr(1-x)Ca(x)Fe2As2

Cited by in corpus (12)

• Quantum-critical scale invariance in a transition metal alloy
• Separation of antiferromagnetism and high-temperature superconductivity in Ca${}_{1-x}$La${}_x$Fe${}_2$As${}_2$ under pressure
• Comprehensive study of out-of-plane transport properties in BaFe${}_2$As${}_2$: Three-dimensional electronic state and effect of chemical substitution
• Antiferromagnetic Stacking of Ferromagnetic Layers and Doping Controlled Phase Competition in Ca${}_{1-x}$Sr${}_x$Co${}_{2-y}$As${}_2$
• Impurity effect and suppression to superconductivity in Na(Fe${}_{0.97-x}$Co${}_{0.03}$T${}_x$)As (T=Cu, Mn)
• Temperature-composition Phase Diagrams for Ba1-xSrxFe2As2 and Ba0.5Sr0.5(Fe1-yCoy)2As2
• Parallel suppression of superconductivity and Fe moment in the collapsed tetragonal phase of Ca0.67Sr0.33Fe2As2 under pressure
• Combined effects of Sr substitution and pressure on the ground states in CaFe${}_2$As${}_2$
• Effects of $c/a$ Anisotropy and Local Crystal Structure on Superconductivity in $A\mathrm{F}{\mathrm{e}}_2({\mathrm{As}}_{1-x}{\mathrm{P}}_x{)}_2$ ($A$=Ba${}_{1-y}$Sr${}_y$, Sr${}_{1-y}$Ca${}_y$ and Eu)
• Magnetotransport studies of optimally doped Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Tuning Incommensurate Charge Order in Ba${}_{1-x}$Sr${}_x$Al${}_4$ and Ba${}_{1-y}$Eu${}_y$Al${}_4$
• Influence of growth flux solvent on anneal-tuning of ground states in CaFe2As2