SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 5: Posters Magnetism II

MA 5.20: Poster

Dienstag, 28. September 2021, 10:00–13:00, P

Magnetic ordering in CePdAl₃ and CePtAl₃ — •Michal Stekiel¹, Petr Cermak^4,5, Wolfgang Simeth^1,2, Martin Meven^4,3, Christian Franz^1,4, Stefan Weber¹, Rudolf Schönmann¹, Vivek Kumar¹, Kirill Nemkovskiy⁴, Hao Deng^4,3, Andreas Bauer¹, Christian Pfleiderer¹, and Astrid Schneidewind⁴ — ¹Technische Universität München, Garching, Germany — ²Paul-Scherrer-Institut, Villigen, Switzerland — ³RWTH Aachen at MLZ, Garching, Germany — ⁴JCNS at MLZ, Garching, Germany — ⁵Charles University, Praha, Czech Republic

In cerium-based intermetallic compounds the interplay of localized 4f electrons with itinerant d electrons may result in a wide range of magnetic and electronic ordering phenomena. Here, we report a comprehensive neutron diffraction study on single crystals of the non-centrosymmetric compounds CePdAl₃, crystallizing in the orthorhombic space group Cmc2₁, and CePtAl₃, crystallizing in the tetragonal space group I4/mmm. In CePdAl₃, a collinear antiferromagnetic structure is observed below T_N = 5.3 K with an ordered moment of 1.64 µ_B/Ce pointing along the a direction. In CePtAl₃, an amplitude-modulated cycloidal structure with an ordering vector (2/300) emerges below T_N = 3.2 K. A symmetry analysis and its connection to the magnetic structures of measured compounds will be presented.