Growth, structure, and physical properties of CeAlGe and CeAlSi single crystals

The RAlX (where R=Rare Earth and X=Ge, Si) family has been recently identified as a large class of Weyl semimetal based on systematic first-principles band structure calculations. Because, depending on the rare earth element, RAlX can have no local moment ordering, be ferromagnetic or antiferromagnetic, the family may offer a possibility of realization of all different types of emergent Weyl fermions, i.e. inversion-symmetry breaking and time-reversal breaking, type-I and type-II. Here, we present details of flux growth, crystal structure and physical properties of CeAlGe and CeAlSi single crystals. Both compounds show multiple magnetic transitions with the highest ferromagnetic ordering transition at 5 and 9 K, respectively, and a few metamagnetic transitions in the field-dependant magnetization. Our results are important for all members in the RAlX family.