Berlin 2015 – wissenschaftliches Programm
TT 21.12: Poster
Montag, 16. März 2015, 15:00–18:00, Poster B
Impact of Y and Mn-codoping on magnetism and superconductivity in La1−zYzFe1−yMnyAsO1−xFx — •Rhea Kappenberger1, Franziska Hammerath1,2,3, Mesfin Asfaw Afrassa1,4, Pietro Carretta2, Samuele Sanna2, Rowena Wachtel1, Christian G.F. Blum1, Anja Wolter-Giraud1, Sabine Wurmehl1,3, and Bernd Büchner1,3 — 1IFW Dresden, Institute for Solid State Research, D-01171 Dresden, Germany — 2Dipartimento di Fisica and Unitá di CNISM di Pavia, Pavia, Italy — 3Institut für Festkörperphysik, TU Dresden, Dresden, Germany — 4Addis Ababa University, Addis Ababa, Ethiopia
It has been shown by Kamihara et al.  that F doping of the iron oxypnictide LaFeAsO leads to the emergence of superconductivity. Doping of the parent compound with Y on the La site also increases Tc , whereas Mn doping on the Fe site has been reported to have a detrimental effect to superconductivity [3,4]. We investigated the interplay of doping by substituting those different positions at the same time. The samples where characterized using EDX, XRD, SQUID and µSR. It was shown that Y doping indeed has a stabilizing effect on the superconductivity even in the presence of small amounts of Mn.
 Y. Kamihara et al., J. Am. Chem. Soc. 130, 3296 (2008).
 H. Takahashi, K. Igawa, K. Arii, Y. Kamihara, M. Hirano,
and H. Hosono, Nature London 453, 376 (2008).
 D. Berardan, L. Pinsard-Gaudart, and N. Drago,
J. Alloys Compd. 481, 470 (2009).
 F. Hammerath et al., Phys. Rev. B 89, 134503 (2014).