Single crystals of Na1−δFe1−xTxAs 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≤x≤0.013) is fully suppressed in the optimally doped sample. The superconducting transition temperature (Tc) is enhanced from 10 K in Na1−δFeAs to 21 K in the optimally doped sample (x=0.019) of the Na1−δFe1−xRhxAs 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 Na1−δFeAs, suggesting a generic phase diagram for both dopants.

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Published in Physical Review B: Condensed Matter and Materials Physics, v. 91, no. 18, article 184516, p. 1-9.

©2015 American Physical Society

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This work has been supported by the Deutsche Forschungsgemeinschaft through the Priority Programme SPP1458 (Grants No. BE1749/13, No. BU887/15-1 and No. HE3439/11), and through the Emmy Noether Programme in projects WU595/3-1 and WU595/3-2 (S.W.). Financial support by RFBR 12-03-91674-ERA_a, 12-03-01143_a, and 12-03-31717 (M.R.) is cordially acknowledged. S.W. thanks the BMBF for support in the frame of the ERA.Net RUS project (Project 01DJ12096, FeSuCo). S.B. thanks for support by BO1912/2-2 and BO1912/3-1.

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