Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 31: Correlated Electrons: Quantum-Critical Phenomena 2
TT 31.5: Vortrag
Mittwoch, 28. März 2012, 16:00–16:15, H 3010
Quantum Phase transitions in CeTi1−xVxGe3 — •Wolfram Kittler1, Veronika Fritsch1, Frank Weber2, and Hilbert Löhneysen1,2 — 1Karlsruher Institut für Technologie, Physikalisches Institut, 76131 Karlsruhe, Germany — 2Karlsruher Institut für Technologie, Institut für Festkörperphysik, 76021 Karlsruhe, Germany
CeTiGe3 is a low-temperature ferromagnet with a Tc ≈ 14 K. It crystallizes in a hexagonal structure with space group P63/mmc. The magnetic moments are located at the Ce atoms and point along the c-axis. Tc can be driven to Tc = 0 by V doping on the Ti sites. Thus CeTi1−xVxGe3 seems to be one of the few ferromagnetic systems that can be driven to a quantum critical point where Tc = 0 by concentration tuning, in this case at xc≈ 0.35.
The magnetic structure of pure CeTiGe3 was determined in detail by powder neutron diffraction. Physical properties of the doped system were investigated with specific-heat, magnetization and resistivity measurements in order to determine the Tc(x)∼|x−xc|p dependence in detail. Our data are comparible with an exponent p = 3/4 expected for a three-dimensional ferromagnet. However p = 1 is also possible.