Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 42: Correlated Electrons: f-Electron Systems and Heavy Fermions 2

TT 42.1: Vortrag

Mittwoch, 18. März 2020, 15:00–15:15, HSZ 204

Low-Temperature Properties of the Non-Centrosymmetric Heavy-fermion Compound CeAl2 — •Christian Oberleitner, Alexander Regnat, Christian Franz, Jan Spallek, Georg Benka, Michael Petrov, Marc Wilde, Andreas Bauer, and Christian Pfleiderer — Physik-Department, Technische Universitaet Muenchen, 85748 Garching, Germany

Heavy-fermion compounds exhibit many unexpected low-temperature properties like unconventional superconductivity, non-Fermi liquid behavior or negative magnetoresistance. In this work, we report a comprehensive study of the non-centrosymmetric heavy-fermion compound CeAl2 with TN= 3.8K. The metallurgical characterization by Laue x-ray scattering and powder x-ray diffraction shows the excellent crystalline quality, which is confirmed by very high RRR values. Subsequently, magnetization, specific heat, torque magnetometry, resistivity, and Hall-effect measurements down to 200mK and up to 14T were carried out. The low-temperature measurements in the antiferromagnetic regime show complex magnetic behavior. Presumably, the Hall-effect cannot be explained by a superposition of anomalous and normal Hall-effect, which suggests a topological contribution.

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