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 Dressel¹ — ¹1. 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 (T_N≈ 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(Fe_1−xIr_x)₂As₂ where electron doping takes place directly in the conducting iron layer, with EuFe₂(As_1−xP_x)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 Ba_0.6Eu_0.4(Fe_1−xCo_x)₂As₂ in juxtaposition to the already highly investigated pure Ba analogue.

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