Different effects of Ni and Co substitution on the transport properties of BaFe2As2
arXiv:1012.0788 · doi:10.1103/PhysRevB.83.054518
Abstract
We report resistivity and Hall effect results on Ba(Fe1-xNix)2As2 and compare them with those in Ba(Fe1-xCox)2As2. The Hall number RH is negative for all x values from 0.01 to 0.14, which indicates that electron carriers dominate the transport both in the magnetic and paramagnetic regime. We analyse the data in the framework of a two-band model. Without any assumption on the number of carriers, we show that the electron resistivity can be estimated with good accuracy in the low temperature paramagnetic range. Although the phase diagrams of the two families are very similar with respect to the extra electrons added in the system, we find that the transport properties differ in several aspects. First, we evidence that the contribution of holes to the transport is more important for Ni doping than for Co doping. Secondly, Ni behaves as a stronger scatterer for the electrons, as the increase of the residual electron resistivity rho/x is about four times larger for Ni than for Co in the most doped samples.
8 pages, 8 figures
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- Raman scattering study of Spin-Density-Wave order and electron-phonon coupling in Ba(FeCo)As
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- Doping Dependence of Hall Coefficient and Evolution of Coherent Electronic State in the Normal State of Fe-based Superconductor BaKFeAs
- Universal pair-breaking in transition metal-substituted iron-pnictide superconductors
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- Temperature-induced Change in the Fermi Surface Topology in the Spin Density Wave Phase of Sr(FeCo)As
- Enhanced Surface Superconductivity in Ba(FeCo)As
- The role of magnetic excitations in magnetoresistance and Hall effect of slightly TM-substituted BaFeAs compounds (TM = Mn, Cu, Ni)
- Magnetotransport properties in the magnetic phase of BaFeTAs (T = Co,Ni): A magnetic excitations approach