Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.25: Poster

Donnerstag, 29. März 2012, 15:00–19:00, Poster B

Effect of hole doping and chemical pressure in Yb(Rh_1−xFe_x)₂Si₂ — •Manuel Mchalwat, Hirale S. Jeevan, Yoshi Tokiwa, Maik Schubert, and Philipp Gegenwart — 1. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

The heavy fermion compound YbRh₂Si₂ shows a quantum critical point when the temperature of antiferromagnetic ordering is suppressed to zero by an external magnetic field. Besides the energy scale defined by the quantum critical fluctuations of the order parameter one finds an additional scale T^* which also merges into the quantum critical point. This scale is connected to a reconstruction of the fermi surface, but it is argued whether a Kondo breakdown or a Zeeman-driven Lifshitz transition is the origin. In order to test both hypothesis we synthesized single crystals of Yb(Rh_1−xFe_x)₂Si₂ to introduce holes into the system. Thus the electronic structure is changed, which should have a strong influence on the Lifshitz transition. The measured low temperature properties are discussed with respect to both scenarios.

The work has been supported by the DFG through FOR 960 (Quantum Phase Transitions).