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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.9: Poster

Montag, 20. März 2017, 15:00–19:00, P2-EG

Characterization of As substituted YbNi₄P₂ single crystals — •Philipp Ross, Kristin Kliemt, and Cornelius Krellner — Institute of Physics, Goethe-University Frankfurt, D-60438 Frankfurt, Germany

The tetragonal compound YbNi₄P₂ has a low Curie temperature, T_C = 0.17 K, which can be further suppressed by substituting P by As. The rare case of a ferromagnetic quantum critical point occurs in the substitution series YbNi₄(P_1−xAs_x)₂ at x≈0.1 [1,2].

Single crystals of YbNi₄(P_1−xAs_x)₂, with various As concentrations were grown by the Czochralski method [3]. Strong effort was undertaken to determine the precise orientation of the as-grown crystals and prepare single-crystalline pieces. These crystals were characterized by electrical transport, heat capacity and magnetization measurements. Here we present the measured data these measurements down to T = 2 K. Furthermore, we characterized the room temperature crystal structure by powder X-ray diffraction and determined the change in the lattice constants for increasing As content using Rietveld refinement.

[1] C. Krellner et al., New J. Phys. 13, 103014 (2011)

[2] A. Steppke et al., Science 339, 933 (2013)

[3] K. Kliemt, C. Krellner, J. Cryst. Growth 449, 129-133 (2016)