Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.2: Poster
Mittwoch, 14. März 2018, 15:00–19:00, Poster B
Low-temperature properties of the non-centrosymmetric heavy-fermion compound CeTAl3 (T = Cu, Ag, Au, Pd, Pt) — Christian Franz3, Stefan Weber1, •Jan Spallek1, Alexander Regnat1, Petr Cermak2, Astrid Schneidewind2, Andreas Bauer1, Anatoly Senyshyn2, and Christian Pfleiderer1 — 1Physik Departement, Technische Universität München, Garching, Deutschland — 2JCNS-MLZ PANDA, Forschungszentrum Jülich, Garching, Deutschland — 3Forschungsreaktor München 2, Garching, Deutschland
We report a comprehensive study of the series of non-centrosymmetric heavy-fermion compounds CeTAl3 (T = Cu, Ag, Au, Pd, and Pt). Large single crystals have been prepared by means of optical float-zoning. The single-crystal ingots were characterized using Laue x-ray scattering, powder x-ray diffraction, and energy dispersive x-ray spectroscopy. For T = Cu, Au, Pd, and Pt the system crystallizes in the non-centrosymmetric I4mm crystal structure, while we observe a slight orthorombic distortion for T = Ag. Subsequently, the magnetization, specific heat, and electrical resistivity were investigated down to temperatures of 200 mK and in magnetic fields of up to 14 T revealing typical heavy-fermion behavior. At low temperatures, CeCuAl3 and CeAuAl3 order antiferromagnetically, whereas CeAgAl3 is a ferromagnet. Indications of magnetic order are observed in CePdAl3. Inelastic neutron scattering studies indicate the presence of so-called vibron modes, i.e., coupled modes of phonons and crystal electric field excitations.