Abstract
We present details of materials synthesis, crystal structure, and anisotropic magnetic properties of single crystals of CeAlGe, a proposed type-II Weyl semimetal. Single-crystal x-ray diffraction confirms that CeAlGe forms in a noncentrosymmetric space group, in line with predictions of nontrivial topology. Magnetization, specific heat, and electrical transport measurements were used to confirm antiferromagnetic order below 5 K, with an estimated magnon excitation gap of K from heat capacity and hole-like carrier density of from Hall effect measurements. The easy magnetic axis is along the [100] crystallographic direction, indicating that the moment lies in the tetragonal plane below 7 K. A spin-flop transition to less than 1 /Ce is observed to occur below 30 kOe at 1.8 K in the () data. Small magnetic fields of 3 and 30 kOe are sufficient to suppress magnetic order when applied along the and axes, respectively, resulting in a complex phase diagram for and a simpler one for .
- Received 14 August 2018
DOI:https://doi.org/10.1103/PhysRevB.98.245132
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