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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

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

TT 33.1: Poster

Wednesday, March 28, 2012, 15:00–19:00, Poster B

Magnetic investigations on EuFe2(As1−xPx)2 single crystals — •Felix Klingert1, Sina Zapf1, Dan Wu1, Shuai Jiang1,2, Hirale S. Jeevan2, Philipp Gegenwart2, and Martin Dressel111.Physikalisches Institut, Universität Stuttgart, Germany — 2I.Physikalisches Institut, Universität Göttingen, Germany

Magnetic susceptibility measurements on a series of EuFe2(As1−xPx)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

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