Anomalous symmetry breaking in Weyl semimetal CeAlGe

Abstract

CeAlGe, a proposed type-II Weyl semimetal, orders antiferromagnetically below 5 K. At 2 K, spin-flop and a spin-flip transitions to less than 1 ${\mu }_B$/Ce are observed in the $M(H)$ data below 30 kOe, ($\mathbf{H}\Vert \mathbf{a}$ and $\mathbf{b}$, and 4.3 kOe, $\mathbf{H}\Vert ⟨110⟩$, respectively, indicating a four-fold symmetry of the $M(H)$ data along the principal directions in the tetragonal $ab$ plane with $⟨110⟩$ set of easy directions. However, anomalously robust and complex twofold symmetry is observed in the angular dependence of resistivity and magnetic torque data in the magnetically ordered state once the field is swept in the $ab$ plane. This twofold symmetry is independent of temperature and field hystereses and suggests a magnetic phase transition that separates two different magnetic structures in the $ab$ plane. The boundary of this magnetic phase transition and possibly the type of low-field magnetic structure can be tuned by an Al deficiency.

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• Nonlinear optical diode effect in a magnetic Weyl semimetal
• Spin order and dynamics in the topological rare-earth germanide semimetals
• Importance of anisotropic interactions for hard-axis/plane ordering of Ce-based ferromagnets
• Structural characterization of the candidate Weyl semimetal CeGaGe
• Incommensurate magnetic order drives singular angular magnetoresistance in a Weyl semimetal
• Anisotropic Magnetic and Transport Properties of RAlGe (R = Y, Gd-Tm, Lu)