Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 41: Correlated Electrons: Quantum-Critical Phenomena

TT 41.12: Talk

Wednesday, March 22, 2017, 12:30–12:45, HSZ 204

YbNi₄(P_1−xAs_x)₂: Single crystal growth and characterization — •Kristin Kliemt¹, Philipp Ross¹, Oliver Stockert², Manuel Brando², and Cornelius Krellner¹ — ¹Goethe-University Frankfurt, Institute of Physics, 60438 Frankfurt, Germany — ²MPI CPfS, 01187 Dresden, Germany

The low lying Curie temperature, T_C = 0.17 K, of the heavy-fermion compound YbNi₄P₂ can be further suppressed by substituting P by As and 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].

Here, we present the growth of YbNi₄(P_1−xAs_x)₂ single crystals with As concentrations from 0≤ x≤ 1 using the Czochralski method from a levitating melt. Recently, this crucible free growth method was successfully implemented to obtain cm-sized oriented single crystals of the unsubstituted compound YbNi₄P₂ [3]. The samples were characterized by electrical transport, heat capacity and magnetization measurements and we will give details about these results. Furthermore, we determined their crystal structure by powder X-ray diffraction and investigated the homogeneity of the As distribution in the crystals using energy dispersive X-ray spectroscopy. In addition, the crystallinity of the samples was checked by neutron Laue backscattering.

[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 (2016).