Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 25: Superconductivity: Fe-based Superconductors - 1111 & 111

TT 25.2: Vortrag

Dienstag, 8. März 2016, 09:45–10:00, H19

Impact of concomitant Y and Mn substitution on properties of La_1−zY_zFe_1−yMn_yAsO_0.9F_0.1 — •Rhea Kappenberger^1,2, Franziska Hammerath^1,2, Mesfin Asfaw Afrassa^1,3, Pierre Rousse¹, Christian Hess¹, Giacomo Prando¹, Matteo Moroni¹, Samuele Sanna⁴, Pietro Carretta⁴, Gianrico Lamura⁵, Anja U. B. Wolter¹, Sirko Kamusella², Hans-Henning Klauss², Sabine Wurmehl^1,2, and Bernd Büchner^1,2 — ¹Leibniz Institute for Solid State and Materials Research Dresden IFW, Dresden, Germany — ²Institut für Festkörperphysik, TU Dresden, Dresden, Germany — ³Addis Ababa University, College of Natural Science, Addis Ababa, Ethiopia — ⁴Dipartimento di Fisica and Unitá di CNISM di Pavia, Pavia, Italy — ⁵CNR-SPIN and Universita di Genova, I-16146 Genova, Italy

The substitution of constituents is frequently used as a local probe to check the microscopic properties of an unconventional superconductor in response to such an "impurity".

In this talk, we present several structural parameters and the superconducting critical temperatures in response to different substitution levels of Mn and Y in La_1−zY_zFe_1−yMn_yAsO_0.9F_0.1. We will discuss our findings in the light of chemical pressure inflicted by Y, which has a significantly smaller ionic radius than La, and strong electron localization caused by small amounts of paramagnetic Mn impurities.