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Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 9: SC: Poster Session

TT 9.29: Poster

Monday, March 22, 2010, 14:00–18:00, Poster A

Superconductivity and magnetism in Eu1−xKxFe2(As1−yPy)2 — •Jannis Maiwald, Hirale S. Jeevan, and Philipp Gegenwart — 1. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich Hund Platz 1, 37077 Göttingen, Germany

We report on a detailed investigation of superconductivity and magnetism in EuFe2As2 by doping of K and P. In this new class of FeAs-based superconductors it is found that superconductivity appears close to a magnetic instability, suggesting a possible unconventional pairing mechanism.
We have synthesized single crystals and powder samples of both doped and undoped samples of EuFe2As2 and investigated their physical properties, by means of heat capacity, resistivity, magnetization, thermal conductivity and seebeck-coefficient measurements. The parent compound shows an antiferromagnetic spin-density-wave accompanied by a structural transition (TSDW) at ≈190K related to the Fe2As2 layers and magnetic ordering of Eu2+ (TN) moments at ≈20K. Upon doping Eu with K >30%, TSDW and TN get suppressed and superconductivity appears at ≈32K. On the other hand P doping to the As site also suppresses the SDW transition and leads to a superconducting phase. However in the latter case the Eu transition temperature remains undisturbed. With further increased P doping the Eu order changes from AFM to FM. We will mainly discuss the thermal conductivity measurements of P and K doped samples.

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