Single crystal investigation of proposed type-II Weyl semimetal CeAlGe

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 noncentrosymmetric I4${}_1$md space group, in line with predictions of non-trivial topology. Magnetization, specific heat and electrical transport measurements were used to confirm antiferromagnetic order below 5 K, with an estimated magnon excitation gap of $\Delta$ = 9.11 K from heat capacity and hole-like carrier density of 1.44 $\times$ 10${}^{20}$ cm${}^{-3}$ from Hall effect measurements. The easy magnetic axis is along the [100] crystallographic direction, indicating that the moment lies in the tetragonal $ab$-plane below 7 K. A spin-flop transition to less than 1 ${\mu }_B$/Ce is observed to occur below 30 kOe at 1.8 K in the $M(H)$ ($\mathbf{H}\Vert \mathbf{a}$) data. Small magnetic fields of 3 kOe and 30 kOe are sufficient to suppress magnetic order when applied along the $a$- and $c$-axes, respectively, resulting in a complex $T-H$ phase diagram for $\mathbf{H}\Vert \mathbf{a}$ and a simpler one for $\mathbf{H}\Vert \mathbf{c}$.

References in corpus (6)

• Discovery of a Three-dimensional Topological Dirac Semimetal, Na3Bi
• Topological Materials: Weyl Semimetals
• Observation of a topological 3D Dirac semimetal phase in high-mobility Cd3As2
• Discovery of Weyl fermion semimetals and topological Fermi arc states
• Theoretical prediction of magnetic and noncentrosymmetric Weyl fermion semimetal states in the R-Al-X family of compounds (R=rare earth, Al=aluminium, X=Si, Ge)
• New fermions on the line in topological symmorphic metals

Cited by in corpus (38)

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• Bulk single crystal growth of the theoretically predicted magnetic Weyl semimetals $R$AlGe ($R$ = Pr, Ce)
• Enhancement of transverse thermoelectric conductivity originating from stationary points in nodal line
• Ferrimagnetic Regulation of Weyl Fermions in a Noncentrosymmetric Magnetic Weyl Semimetal
• Multiple Weyl fermions in the noncentrosymmetric semimetal LaAlSi
• Observation of Fermi arcs and Weyl nodes in a non-centrosymmetric magnetic Weyl semimetal
• Topological features in the ferromagnetic Weyl semimetal CeAlSi: Role of domain walls
• Tuning the nontrivial topological properties of the Weyl semimetal CeAlSi
• Origin and Large Enhancement of Large Spin Hall Angle in Weyl Semimetals LaAl$X$ ($X$=Si, Ge)
• Stripe Helical Magnetism and Two Regimes of Anomalous Hall Effect in NdAlGe
• Multi-k magnetic structure and large anomalous Hall effect in candidate magnetic Weyl semimetal NdAlGe
• Quantum oscillations in Noncentrosymmetric Weyl semimetals RAlSi (R = Sm and Ce)
• Topological Hall effect in CeAlGe
• Pressure tuning domain-wall chirality in noncentrosymmetric magnetic Weyl semimetal CeAlGe
• Magnetic, thermodynamic, and magnetotransport properties of CeGaGe and PrGaGe single crystals
• Electronic structure and physical properties of candidate topological material GdAgGe
• Nonlinear optical diode effect in a magnetic Weyl semimetal
• Anomalous symmetry breaking in Weyl semimetal CeAlGe
• Development of the magnetism in the solid solution of the candidate Weyl semimetals Ce${}_x$Pr${}_{1-x}$AlGe
• Molecular beam epitaxy growth of nonmagnetic Weyl semimetal LaAlGe thin film
• Spin-lattice relaxation phenomena in the magnetic state of a suggested Weyl semimetal CeAlGe
• How to identify and characterize strongly correlated topological semimetals
• Crystallographic defects in Weyl semimetal LaAlGe
• Directional field-dependence of tunable magnetic domains in noncentrosymmetric ferromagnetic Weyl semimetal CeAlSi
• Spin order and dynamics in the topological rare-earth germanide semimetals
• Experimental study of transport properties of Weyl semimetal LaAlGe thin films grown by molecular beam epitaxy
• Structural characterization of the candidate Weyl semimetal CeGaGe
• Anisotropic metamagnetism and magnetotransport of heavy rare-earth orthorhombic single-crystal TbAlGe
• Importance of anisotropic interactions for hard-axis/plane ordering of Ce-based ferromagnets
• On the magnetic contribution of itinerant electrons to neutron diffraction in the topological antiferromagnet CeAlGe
• Zone-selection effect of photoelectron intensity distributions in a nonsymmorphic system RAlSi (R : Ce and Nd)
• Pressure-induced Superconductivity in Noncentrosymmetric Weyl Semimetals LaAlX (X = Si and Ge)
• The self-organized vacancy order in Pr${}_9$Ge${}_{16}$
• Anisotropic Magnetic and Transport Properties of RAlGe (R = Y, Gd-Tm, Lu)