Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 54: Focused Session: Magnetism & Superconductivity in Fe-based Pnictides and Chalcogenides (jointly with MA)
TT 54.6: Vortrag
Donnerstag, 14. März 2013, 12:15–12:30, H20
Disentangling Magnetism and Superconductivity in EuFe2(As1−xPx)2 — •Sina Zapf1, Tomislav Ivek1, Felix Klingert1, Fabian Pfister1, Shuai Jiang1, Dan Wu1, Hirale S. Jeevan2, Philipp Gegenwart2, Reinhard K. Kremer3, and Martin Dressel1 — 11. Physikalisches Institut, Universität Stuttgart — 2I. Physikalisches Institut, Universität Göttingen — 3Chemical Service Group, MPI-FKF Stuttgart
Due to local magnetic ordering of Eu2+, EuFe2(As1−xPx)2 is a perfect system to study the interplay between superconductivity (SC) and magnetism in iron pnictides. However, there is still an ongoing debate about the extent of the superconducting dome and the development of the local Eu magnetic ordering with chemical pressure [1,2]. Especially the question whether SC coexists with ferro- (FM) or antiferromagnetic (AFM) Eu2+ ordering has drawn tremendous interest.
We have performed a systematic study on a set of high-quality single crystals (x = 0, 0.12, 0.145, 0.15, 0.165, 0.17, 0.26, 0.35 and 1) using DC resistivity, as well as DC and AC magnetic susceptibility measurements along the principal crystallographic directions. By combining these techniques we identify the different phases, prove that AFM interlayer coupling coexists with SC and discuss the complex magnetization behaviour of these compounds. Our investigations reveal the delicate interplay between SC and magnetism.
[1] Jeevan et al., PRB 83, 054511 (2011)
[2] Cao et al., Condens. Matter 23, 464204 (2011)