Work

Structural and magnetic investigations of the Weyl semimetal family CeAlSi 1– x Ge x

Year: 2026

Type: article

Abstract: We report a systematic study of the structural and magnetic evolution in CeAlSi 1– x Ge x , a series of materials which provide a tunable platform for exploring magnetism in noncentrosymmetric Ce-based intermetallics. Polycrystalline samples and single crystals were synthesized using arc melting and flux growth techniques. Structural characterization by X-ray diffraction shows a continuous increase in the unit-cell parameters with increasing Ge content, with no evidence of a structural phase transition across the series. Magnetization measurements reveal a suppression of the ferromagnetic ordering temperature of CeAlSi with increasing Ge substitution, indicating a crossover toward antiferromagnetic behaviour in Ge-rich compositions. Neutron diffraction measurements performed on selected compositions show that weak magnetic intensity appears on some structural Bragg peaks below the magnetic ordering temperature. These results elucidate the relationship between chemical substitution, crystal structure, and magnetic ground states in CeAlSi 1– x Ge x , and establish this system as a model platform for studying compositionally tuned magnetic order in noncentrosymmetric materials.

Source: Acta Crystallographica Section B Structural Science Crystal Engineering and Materials

DOI: 10.1107/s2052520626002635