Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 35: Correlated Electrons: Quantum-Critical Phenomena - Experiment I
TT 35.7: Vortrag
Dienstag, 1. April 2014, 11:00–11:15, HSZ 204
Single crystal growth of the ferromagnetic heavy fermion compound YbNi4P2 — •Kristin Kliemt and Cornelius Krellner — Physikalisches Institut, Goethe University Frankfurt, 60438 Frankfurt am Main, Germany
In the heavy fermion metal
YbNi4P2 a ferromagnetic (FM) transition at TC = 0.17 K
was observed recently [1]. This transition can be further suppressed by
substituting As on the P site.
Investigation of YbNi4(P1−xAsx)2
showed the appearance of the first clear-cut example of a
ferromagnetic quantum critical point in metals
at x ≤ 0.08 [2].
High quality single crystals are required to investigate this new compound
in more detail.
Here, we report on the single crystal growth of YbNi4P2 in a Bridgman-type furnace. Because of the incongruent melting of YbNi4P2, the growth was done from a Ni-P self flux at about 1400∘C. Subsequently, the flux was removed by centrifugation at 1000∘C. The quality of the crystals was verified by resistivity and magnetic measurements from 300 to 2 K. In particular, we address the challenge, how to avoid the formation of impurity phases and flux inclusions by variation of crucible shapes and growth conditions like temperature, duration, velocity of cooling and flux composition. With this optimization we obtained single crystals suitable for several measurement techniques as e.g. ARPES, STM, NMR, ESR, and magnetization to unravel the nature of the ferromagnetism in YbNi4P2.
[1] C. Krellner et al., New J. Phys. 13, 103014 (2011)
[2] A. Steppke et al., Science 339, 933 (2013)