Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session

TT 33.1: Poster

Mittwoch, 28. März 2012, 15:00–19:00, Poster B

Magnetic investigations on EuFe₂(As_1−xP_x)₂ single crystals — •Felix Klingert¹, Sina Zapf¹, Dan Wu¹, Shuai Jiang^1,2, Hirale S. Jeevan², Philipp Gegenwart², and Martin Dressel¹ — ¹1.Physikalisches Institut, Universität Stuttgart, Germany — ²I.Physikalisches Institut, Universität Göttingen, Germany

Magnetic susceptibility measurements on a series of EuFe₂(As_1−xP_x)₂ single crystals (x = 0, 0.05, 0.12, 0.25, 0.35) show, how the isovalent P substitution on the As site influences the magnetic ordering of the Eu²⁺ spins, which appears at low temperatures additionally to the spin-density-wave (SDW) or superconducting (SC) phase of the Fe subsystem. Thus this system provides an extraordinary possibility to study the interplay of magnetism and SC.

The Eu²⁺ moments order ferromagnetic (FM) in the ab-plane, but depending on the P content the interlayer coupling develops from antiferromagnetic (in the SDW- and SC-phase) to ferromagnetic coupling (for high substitution). We have previously reported low field magnetization measurements, showing an additional canting of Eu²⁺ spins out of the plane, which leads to a FM component along the c-direction and gets stronger with the suppression of the SDW ordering of Fe [1]. We have now performed a detailed study on a series of samples, which includes angle dependent magnetization measurements, investigating in detail the interplay of Fe and Eu magnetic ordering.
S. Zapf et al., PRB(R) 84, 140503