Charge Transport in Ba${}_{1-x}$Rb${}_x$Fe${}_2$As${}_2$ Single Crystals

Abstract

Recent studies in heavily hole-doped iron-based superconductor RbFe${}_2$As${}_2$ have suggested the emergence of novel electronic nematicity directed along the Fe-As direction, 45${}^{\circ }$ rotated from the usual nematicity ubiquitously found in BaFe${}_2$As${}_2$ and related materials. This motivates us to study the physical properties of Ba${}_{1-x}$Rb${}_x$Fe${}_2$As${}_2$, details of which remain largely unexplored. Here we report on the normal-state charge transport in Ba${}_{1-x}$Rb${}_x$Fe${}_2$As${}_2$ superconductors by using high-quality single crystals in the range of Rb concentration $0.14\le x\le 1.00$. From the systematic measurements of the temperature dependence of electrical resistivity $\rho (T)$, we find a signature of a deviation from the Fermi liquid behavior around the optimal composition, which does not seem related to the antiferromagnetic quantum criticality but has a potential link to hidden nematic quantum criticality. In addition, electron correlations derived from the coefficient of $T^2$ resistivity show a marked increase with Rb content near the heavily hole-doped end, consistent with the putative Mott physics near the $3d^5$ electron configuration in iron-based superconductors.

6 pages, 4 figures

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