Crystal growth and the electronic phase diagram of the 4$d$ doped Na${}_{1-\delta }$Fe${}_{1-x}$Rh${}_x$As in comparison with 3$d$ doped Na${}_{1-\delta }$Fe${}_{1-x}$Co${}_x$As

Abstract

Single crystals of Na${}_{1-\delta }$Fe${}_{1-x}$T${}_x$As with T = Co, Rh have been grown using a self-flux technique. The crystals were thoroughly characterized by powder X-ray diffraction, magnetic susceptibility and electronic transport with particular focus on the Rh-doped samples. Measurements of the specific heat and ARPES were conducted exemplarily for the optimally doped compositions. The spin-density wave transition (SDW) observed for samples with low Rh concentration ($0\le x\le 0.013$) is fully suppressed in the optimally doped sample. The superconducting transition temperature ($T_c$) is enhanced from $10$~K in Na${}_{1-\delta }$FeAs to $21$~K in the optimally doped sample ($x$ = 0.019) of the Na${}_{1-\delta }$Fe${}_{1-x}$Rh${}_x$As series and decreases for the overdoped compounds, revealing a typical shape for the superconducting part of the electronic phase diagram. Remarkably, the phase diagram is almost identical to that of Co-doped Na${}_{1-\delta }$FeAs, suggesting a generic phase diagram for both dopants.

arXiv comment9 pages, 12 figures

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