Effects of transition metal substitutions on the incommensurability and spin fluctuations in BaFe2As2 by elastic and inelastic neutron scattering

Abstract

The spin fluctuation spectra from nonsuperconducting Cu-substituted, and superconducting Co-substituted, BaFe2As2 are compared quantitatively by inelastic neutron scattering measurements and are found to be indis- tinguishable. Whereas diffraction studies show the appearance of incommensurate spin-density wave order in Co and Ni substituted samples, the magnetic phase diagram for Cu substitution does not display incommensu- rate order, demonstrating that simple electron counting based on rigid-band concepts is invalid. These results, supported by theoretical calculations, suggest that substitutional impurity effects in the Fe plane play a signifi- cant role in controlling magnetism and the appearance of superconductivity, with Cu distinguished by enhanced impurity scattering and split-band behavior.

5 pages, 5 figures, Major change in the manuscript

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Cited by in corpus (26)

• Dependence of carrier doping on the impurity potential in transition-metal-substituted FeAs-based superconductors
• Avoided quantum criticality and magnetoelastic coupling in BaFe${}_{2-x}$Ni${}_x$As${}_2$
• Phase diagram and physical properties of NaFe${}_{1-x}$Cu${}_x$As single crystals
• Local orthorhombic lattice distortions in the paramagnetic tetragonal phase of superconducting NaFe${}_{1-x}$Ni${}_x$As
• Magnonlike dispersion of spin resonance in Ni-doped BaFe${}_2$As${}_2$
• The anomaly Cu doping effects on LiFeAs superconductors
• Fermi surface and effective masses in photoemission response of the (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ superconductor
• Possible unconventional superconductivity in substituted BaFe${}_2$As${}_2$ revealed by magnetic pair-breaking studies
• Doping effect of Cu and Ni impurities on the Fe-based superconductor Ba0.6K0.4Fe2As2
• Robust antiferromagnetic spin waves across the metal-insulator transition in hole-doped BaMn${}_2$As${}_2$
• Spin dynamics near a putative antiferromagnetic quantum critical point in Cu substituted BaFe${}_2$As${}_2$ and its relation to high-temperature superconductivity
• Doping evolution of antiferromagnetism and transport properties in the non-superconducting BaFe2-2xNixCrxAs2
• Phase diagram and neutron spin resonance of superconducting NaFe${}_{1-x}$Cu${}_x$As
• Local Structure and Hyperfine Interactions of 57Fe in NaFeAs Studied by Mossbauer Spectroscopy
• Doping effects of Cr on the physical properties of BaFe${}_{1.9-x}$Ni${}_{0.1}$Cr${}_x$As${}_2$
• Local breaking of four-fold rotational symmetry by short-range magnetic order in heavily overdoped Ba(Fe${}_{1-x}$Cu${}_x$)${}_2$As${}_2$
• Fermi surfaces and Phase Stability of Ba(Fe${}_{1-x}$M${}_x$)${}_2$As${}_2$ (M=Co, Ni, Cu, Zn)
• Observation of charge accumulation and onsite Coulomb repulsion at transition metal impurities in the iron pnictides
• Spin polarization of Ru in superconducting Ba(Fe${}_{0.795}$Ru${}_{0.205}$)${}_2$As${}_2$ studied by x-ray resonant magnetic scattering
• Substitution of Ni for Fe in superconducting Fe${}_{0.98}$Te${}_{0.5}$Se${}_{0.5}$ depresses the normal-state conductivity but not the magnetic spectral weight
• Impurity effects on spin dynamics in magnetic and superconducting iron pnictides and chalcogenides
• Enhanced low-energy magnetic excitations evidencing the Cu-induced localization in an Fe-based superconductor Fe${}_{0.98}$Te${}_{0.5}$Se${}_{0.5}$
• Structural and antiferromagnetic properties of Ba(Fe${}_{1-x-y}$Co${}_x$Rh${}_y$)${}_2$As${}_2$ compounds
• Low-energy, planar magnetic defects in BaFe2As2: nanotwins, twins, antiphase and domain boundaries
• Fluctuating magnetism of Co- and Cu-doped NaFeAs
• Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe${}_{0.875}$Ti${}_{0.125}$)${}_2$As${}_2$