Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 28: Correlated Electrons: Quantum-Critical Phenomena - Experiment
TT 28.8: Vortrag
Dienstag, 8. März 2016, 12:00–12:15, H21
YbNi4P2: Single crystal growth by the Czochralski method and high-field magnetization measurements — •Kristin Kliemt1, Tobias Förster2, Manuel Brando3, and Cornelius Krellner1 — 1Goethe-University, Frankfurt, Germany — 2HLD, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 3MPI for Chemical Physics of Solids, Dresden, Germany
We have investigated a new generation of YbNi4P2 single crystals that were grown
from a levitating melt by the Czochralski method. With TC= 0.17 K, this
ferromagnetic material has the lowest Curie temperature ever observed among
stoichiometric compounds [1]. A quantum critical point occurs in the substitution
series YbNi4(P1−xAsx)2 at x≈ 0.1 [2].
The hybridization between localized
f-electrons and the conduction electrons leads to a Fermi-liquid ground
state with narrow bands and strongly enhanced effective electronic masses
(heavy fermion system, Kondo temperature 8 K). An
external magnetic field can split the bands, deform the Fermi surface and
simultaneously suppress the Kondo interaction.
If such a deformation changes the topology, it is called
a Lifshitz transition. Previous thermodynamic and electrical transport studies have found
indications for Lifshitz transitions in this Kondo lattice system [3]. We report
on results of high-field magnetization measurements at low
temperature to further investigate the putative Lifshitz transitions in YbNi4P2.
[1] C. Krellner et al., NJP 13, 103014 (2011)
[2] A. Steppke et al., Science 339, 933 (2013)
[3] S. Friedemann, H. Pfau (unpublished)