Regensburg 2022 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity: Poster Session
TT 30.2: Poster
Thursday, September 8, 2022, 15:00–18:00, P1
Magnetic order in transition-metal doped CaKFe4As4 and the interplay with superconductivity — •Andreas Kreyssig — Institute for Experimental Physics 4, Ruhr-Universität Bochum, 44801 Bochum, Germany — Ames Laboratory, U.S. DOE, and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
CaKFe4As4 is an iron arsenide superconductor in which partial substitution of Fe by a transition metal shifts the ground state from superconducting to antiferromagnetically ordered. The magnetic structure is a hedgehog spin-vortex crystal arrangement within the Fe planes. This magnetic order is different from the stripe-type spin density wave observed in other iron arsenide superconductor, however, related to the same entangled propagation vectors based on Fermi-surface nesting. In this presentation the determination of the magnetic order will be reviewed and the interplay of the magnetism with superconductivity will be discussed in detail.
This work was supported by the U. S. DOE, BES, DMSE, under Contract DE-AC02-07CH11358. This research used resources at HFIR, a U. S. DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.