Oral: Anomalous angular magnetoresistance of a proposed type-II Weyl semimetal CeAlGe*

CeAlGe, a proposed type-II Weyl semimetal, orders antiferromagnetically below 5 K in a zero magnetic field. In the magnetically ordered state, the magnetic moment lies in the tetragonal ab plane, and the M(H) data show a four-fold symmetry along the principal directions in the ab plane. However, anomalously robust and complex two-fold symmetry is observed in the angular dependence of resistivity and magnetic torque data in the magnetically ordered state if the field is swept in the ab plane. This two-fold symmetry is independent of temperature and field-hystereses. We will show that this anomalous behavior is the result of complex magnetic structures and can be tuned by an Al deficiency.