Dresden 2017 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 33: Transport II - charge transport

MM 33.1: Talk

Tuesday, March 21, 2017, 12:00–12:15, IFW D

Combined resistivity and Hall effect study on Na(Fe,Rh)As single crystals — Frank Steckel¹, •Federico Caglieris¹, Robert Beck¹, Maria Roslova², Dirk Bombor¹, Igor Morozov^1,3, Sabine Wurmehl^1,4, Bernd Büchner^1,4,5, and Christian Hess^1,5 — ¹Leibniz-Institute for Solid State and Materials Research, IFW-Dresden, 01069 Dresden, Germany — ²Department of Chemistry and Food Chemistry, TU Dresden, 01062 Dresden, Germany — ³Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia — ⁴Institut für Festkörperphysik, TU Dresden, 01069 Dresden, Germany — ⁵Center for Transport and Devices, Technische Universität Dresden, 01069 Dresden, Germany

Electrical transport measurements are used to study the Rh-doped NaFeAs superconductor series with a focus on the tetragonal phase. The resistivity curvature has an anomalous temperature dependence evidencing in the phase diagram two crossover regions of changes in the scattering rate, the effective mass as well as of the charge carrier density. The first crossover region is directly connected to the structural transition and resembles the onset of resistivity anisotropy. The second crossover region can as well be deduced from the temperature dependent Hall coeffcient. A comparison to literature NMR data suggests this region to be connected with nematic fluctuations far above the tetragonal to orthorhombic phase transition.