Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 78: Correlated Electrons: Poster Session
TT 78.3: Poster
Donnerstag, 10. März 2016, 15:00–18:30, Poster D
Low-temperature structure and Fermi surface of (La,Ce)TiGe3 — •Tobias Förster1, Helge Rosner2, Jacob Grasemann1, Marc Uhlarz1, Wolfram Kittler3, Veronika Fritsch4, Oliver Stockert2, Jochen Wosnitza1, and Hilbert v. Löhneysen3 — 1Dresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2Max Planck Institute f. Chemical Physics of Solids, Dresden, Germany — 3Karlsruhe Institute of Technology, Karlsruhe, Germany — 4Institut für Physik, Universität Augsburg, Augsburg, Germany
CeTiGe3 presents the rare case of a ferromagnetically (TC ≈ 14 K) ordered Kondo-lattice compound and is probably the first known example of an intermetallic hexagonal perovskite of the BaNiO3 structure type. LaTiGe3 may be used as its nonmagnetic reference, since both compounds crystallize in the same crystal structure [1,2]. To clarify the interplay between structural, localized, and itinerant degrees of freedom an accurate knowledge of the electronic band structure is necessary. Here, we present a detailed electronic-structure study of both compounds applying full potential density functional calculations. Since the Ge’s atomic position couples strongly to the band structure at the Fermi energy, a low-temperature, high-resolution structure refinement was made. We attempt to separate the influence of different parameters on the topology of the respective Fermi surfaces and will compare our results with de Haas-van Alphen measurements.
[1] P. Manfrinetti et al., Solid State Commun. 135 (2005) 444.
[2] W. Kittler et al., PRB 88 (2013) 165123.