1. Comprehensive study of out-of-plane transport properties in BaFe2As2 : Three-dimensional electronic state and effect of chemical substitution
- Author
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Masamichi Nakajima, M. Nagafuchi, and Setsuko Tajima
- Subjects
Physics ,Condensed matter physics ,Scattering ,Electron ,State (functional analysis) ,01 natural sciences ,010305 fluids & plasmas ,Metal ,Hall effect ,Electrical resistivity and conductivity ,visual_art ,Phase (matter) ,0103 physical sciences ,visual_art.visual_art_medium ,010306 general physics ,Anisotropy - Abstract
We investigated the out-of-plane transport properties of parent and chemically substituted ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$ for various types of substitution. Based on the studies of the Hall coefficient and chemical-substitution effect, we have clarified the origin for the unusual temperature dependence of out-of-plane resistivity ${\ensuremath{\rho}}_{c}(T)$ in the high-temperature paramagnetic-tetragonal phase. Electron (hole) carriers have an incoherent (coherent) character, which is responsible for nonmetallic (metallic) ${\ensuremath{\rho}}_{c}(T)$. Although the electron and hole contributions are almost comparable, a slightly larger contribution comes from electrons at high temperatures but from holes at low temperatures, resulting in a maximum in ${\ensuremath{\rho}}_{c}(T)$. In the low-temperature antiferromagnetic-orthorhombic phase, the major effect of substitution is to increase the residual-resistivity component, as in the case for the in-plane transport. In particular, Co atoms substituted for Fe give rise to strong scattering with large ac anisotropy. We found that K substitution induces a nonmetallic behavior in ${\ensuremath{\rho}}_{c}(T)$ at low temperatures, which is likely due to a weakly localized nature along the $c$-axis direction.
- Published
- 2018
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