Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 45: Superconductivity: Fe-based Superconductors - 1111,111, FeSe
TT 45.6: Talk
Tuesday, April 1, 2014, 15:15–15:30, HSZ 201
Phase diagram characterization of NaFe1−xRhxAs by electrical transport — •Frank Steckel1, Robert Beck1, Dirk Bombor1, Maria Roslova1,4, Igor Morozov1,4, Sabine Wurmehl1,3, Bernd Büchner1,2, and Christian Hess1,2 — 1Leibniz Institute for Solid State and Materials Research, IFW Dresden, 01069 Dresden — 2Center for Transport and Devices, TU Dresden, 01069 Dresden — 3Institut für Festkörperphysik, TU Dresden, 01069 Dresden — 4Moscow State University, 119991 Moscow
The electronic properties of single crystals from the pure and Rh-doped unconventional high temperature pnictide superconductor NaFeAs are probed by resistivity and Hall effect measurements. Typical transition temperatures for the undoped parent compound are found and their evolution upon 4d-electron doping up to x = 6% in NaFe1−xRhxAs are investigated. The structural and magnetic transition signatures are strongly suppressed upon Rh-doping. Already at x = 1.8% no sign of the aforementioned phase transitions are found. Optimal doping is found at x=2% doping level with TC ∼ 19.6 K. A temperature-composition phase diagram is constructed from the resistivity, Hall coefficient and magnetization data. The comparison to the 3d-electron doped NaFe1−xCoxAs phase diagram yields astonishing similarities as found before in Rh- and Co- doped BaFe2As2. Thus, we suggest a generic behavior upon Rh- and Co-doping in Fe-based superconductors. Accordingly the structural and antiferromagnetic transition temperatures as well as the superconducting transition may depend only on the doping level and the doped charge.