Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Superconductivity: Poster Session

TT 21.17: Poster

Montag, 16. März 2015, 15:00–18:00, Poster B

Optical measurements on iron pnictides containing Eu — •David Neubauer1, Andreas Baumgartner1, Johannes Merz1, Sina Zapf1, Saicharan Aswartham2, Sabine Wurmehl3, Wen-He Jiao4, Guang-Han Cao4, and Martin Dressel111. Physikalisches Institut, Universität Stuttgart, Germany — 2University of Kentucky, Lexington, USA — 3IFW, Dresden, Germany — 4Zhejiang University, Hangzhou, China

The interplay of magnetism with superconductivity is a fascinating, highly debated field of research and many questions still remain unsolved. Members of the EuFe2As2 family are a perfectly suited playground for investigations concerning this topic, due to the peculiarity of strong local magnetism of the europium (TN≈ 20K), which is a unique feature among the 122 iron pnictides. Optical studies of the parent compound have already revealed that the spin density wave formation deviates from the other 122 pnictides [1]. To get more insight into the superconducting properties of the EuFe2As2 family we carried out an optical study on differently doped samples. We compare Eu(Fe1−xIrx)2As2 where electron doping takes place directly in the conducting iron layer, with EuFe2(As1−xPx)2 which corresponds to isovalent substitution at atomic positions out of the Fe-plane. The influence of the Eu is furthermore investigated by placing data we obtained on Ba0.6Eu0.4(Fe1−xCox)2As2 in juxtaposition to the already highly investigated pure Ba analogue.

[1] D. Wu et al., Phys. Rev. B 79, 155103 (2009).

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