Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Superconductivity: Poster Session

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 Büchner1,31IFW 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. [1] 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 [2], 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.

[1] Y. Kamihara et al., J. Am. Chem. Soc. 130, 3296 (2008).

[2] H. Takahashi, K. Igawa, K. Arii, Y. Kamihara, M. Hirano,

and H. Hosono, Nature London 453, 376 (2008).

[3] D. Berardan, L. Pinsard-Gaudart, and N. Drago,

J. Alloys Compd. 481, 470 (2009).

[4] F. Hammerath et al., Phys. Rev. B 89, 134503 (2014).

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