Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 55: Correlated Electrons: Quantum-Critical Phenomena - Experiment II
TT 55.3: Talk
Wednesday, April 2, 2014, 11:45–12:00, HSZ 204
Anisotropy and quantum criticality in CeTi1−xVxGe3 single crystals — •Wolfram Kittler1, Veronika Fritsch1, Paul C. Canfield2, and Hilbert v. Löhneysen1 — 1Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — 2Ames Laboratory, US DOE, and Dept. of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA
CeTiGe3 is a heavy-fermion ferromagnet with the Curie-temperature TC ≈ 14 K [1]. It crystallizes in a hexagonal structure with space group P63/mmc. The magnetic moments are located at the Ce sites pointing along the c-axis [2]. Partial substitution of Ti by V leads to a suppression of TC toward zero. Thus CeTi1−xVxGe3 seems to be one of the few ferromagnetic systems that can be driven to a quantum critical point at a critical V concentration xc≈ 0.38.
We will present detailed measurements of magnetization, electrical resistivity and specific heat on flux-grown single crystals showing the highly anisotropic Ising-like magnetism in this system. Furthermore we will demonstrate signatures of non-Fermi-liquid behavior when approaching the critical concentration.
[1] P. Manfrinetti et al., Sol. State Comm. 135 (2005) 444
[2] W. Kittler et al., Phys. Rev. B 88 (2013) 165123