Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 41: Correlated Electrons: Quantum-Critical Phenomena

TT 41.10: Vortrag

Mittwoch, 22. März 2017, 12:00–12:15, HSZ 204

Effect of tuning parameters on the partially frustrated magnetic order in CePdAl — •Stefan Lucas1,2, Zita Hüsges3, Veronika Fritsch4, Jens-Uwe Hoffmann3, Karel Prokeš3, Manfred Reehuis3, Hilbert von Löhneysen5, and Oliver Stockert11Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Institute of Solid State Physics, TU Dresden, Dresden, Germany — 3Helmholtz-Zentrum Berlin, Berlin, Germany — 4EP 6, Electronic Correlations and Magnetism, Augsburg University, Augsburg, Germany — 5Karlsruhe Institute of Technology, Institute for Solid State Physics, Karlsruhe, Germany

The heavy-fermion system CePdAl is a model system to investigate magnetic frustration in a metallic material. An arrangement of the Ce moments on a distorted kagomé lattice in the basal plane together with a strong Ising anisotropy leads to geometric frustration. This results in a complex interplay with the RKKY and Kondo interaction, where only two thirds of the magnetic moments are long-range ordered, whereas the remaining third is frustrated and/or screened by the Kondo effect below the antiferromagnetic ordering temperature of 2.7 K. Using different in-plane tuning parameters like magnetic fields and especially uniaxial pressure, we investigated the stability of the complex magnetic order. Thereby, we were able to stabilize the magnetic order under moderate uniaxial pressures of up to 1 kbar.

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