2015/02/10 by Frank Steckel, Maria Roslova, Robert Beck +23
Chemistry · Materials Science · Physics and Astronomy · #Analytical Chemistry (journal) #Chemistry #Condensed matter physics #Crystallography #Dopant #Doping #Iron-based superconductors research #Materials science #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.91.184516
published as Phys. Rev. B 91 (2015) 184516 · 9 pages, 12 figures
arxiv created 2015/02/10 · openalex publication_date 2015/05/27 · arxiv updated 2015/06/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Single crystals of Na_1\ensuremath-\ensuremathδFe_1\ensuremath-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\ensuremath≤x\ensuremath≤0.013) is fully suppressed in the optimally doped sample. The superconducting transition temperature (Tc) is enhanced from 10 K in Na_1\ensuremath-\ensuremathδFeAs to 21 K in the optimally doped sample (x=0.019) of the Na_1\ensuremath-\ensuremathδFe_1\ensuremath-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 Na_1\ensuremath-\ensuremathδFeAs, suggesting a generic phase diagram for both dopants.