Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 71: Correlated Electrons: Poster Session

TT 71.22: Poster

Mittwoch, 18. März 2015, 15:00–18:00, Poster B

Ferromagnetic quantum critical point in CeTi1−xVxGe3 — •Wolfram Kittler1, Christian Taubenheim1, Veronika Fritsch1,2, Paul C. Canfield3, and Hilbert v. Löhneysen11Karlsruher Institut für Technologie, Physikalisches Institut, Germany — 2Universität Augsburg, Institut für Physik, Experimentalphysik VI, Germany — 3Ames Laboratory, US DOE, and Dept. of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA

CeTiGe3 is a moderate heavy-fermion system, crystallizing in a hexagonal perovskite structure. It orders ferromagnetically at TC = 14.3 K. Experiments on polycrystals have shown that the substitution of Ti with V suppresses the magnetic order, suggesting the existence of a ferromagnetic quantum critical point [1]. We have successfully grown single crystals of CeTi1−xVxGe3. The strong uniaxial anisotropy with the easy axis along the c-axis is reduced with increasing x and turns into an easy ab-plane anisotropy for x = 1. The magnetic ordering temperature is indeed shifted to TC → 0 at a V concentration xc ≈ 0.4. We present data of magnetization, electrical resistivity and specific heat down to T = 100 mK of CeTi1−xVxGe3. These data support the existence of a ferromagnetic quantum critical point.

[1] W. Kittler et al., Phys. Rev. B 88, 165123 (2013).

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