Bulk single crystal growth of the theoretically predicted magnetic Weyl semimetals $R$AlGe ($R$ = Pr, Ce)

Abstract

We explore two methods for single crystal growth of the theoretically proposed magnetic Weyl semimetals $R$AlGe ($R$ = Pr,Ce), which prove that a floating zone technique, being both crucible- and flux-free, is crucial to obtain perfectly stoichiometric $R$AlGe crystals. In contrast, the crystals grown by a flux growth technique tend to be Al-rich. We further present both structural and elemental analysis, along with bulk magnetization and electrical resistivity data on the crystals prepared by the floating zone technique. Both systems with the intended 1:1:1 stoichiometry crystallize in the anticipated polar I4${}_1$md (No. 109) space group, although neither displays the theoretically expected ferromagnetic ground state. Instead PrAlGe displays a spin-glass-like transition below 16 K with an easy-c-axis and CeAlGe has an easy-ab-plane antiferromagnetic order below 5 K. The grown crystals provide an ideal platform for microscopic studies of the magnetic field-tunable correlation physics involving magnetism and topological Weyl nodes.

References in corpus (2)

• Discovery of Weyl fermion semimetals and topological Fermi arc states
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Cited by in corpus (21)

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• Transition from Intrinsic to Extrinsic Anomalous Hall Effect in the Ferromagnetic Weyl Semimetal PrAlGe${}_{1-x}$Si${}_x$
• Multiple Weyl fermions in the noncentrosymmetric semimetal LaAlSi
• Field-Induced Lifshitz Transition in the Magnetic Weyl Semimetal Candidate PrAlSi
• Stripe Helical Magnetism and Two Regimes of Anomalous Hall Effect in NdAlGe
• 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
• Anomalous symmetry breaking in Weyl semimetal CeAlGe
• Anatomy of anomalous Hall effect due to magnetic fluctuations
• Anomalous Hall effect with plateaus observed in a magnetic Weyl semimetal NdAlGe at low temperatures
• Molecular beam epitaxy growth of nonmagnetic Weyl semimetal LaAlGe thin film
• On the magnetic contribution of itinerant electrons to neutron diffraction in the topological antiferromagnet CeAlGe
• Spin order and dynamics in the topological rare-earth germanide semimetals
• Importance of anisotropic interactions for hard-axis/plane ordering of Ce-based ferromagnets
• Weyl nodes and Kondo interaction in noncentrosymmetric semimetals RGaGe (R=La, Ce and Pr) with long Fermi arcs
• Structural characterization of the candidate Weyl semimetal CeGaGe
• Experimental study of transport properties of Weyl semimetal LaAlGe thin films grown by molecular beam epitaxy
• Deterministic Switching of Perpendicular Ferromagnets by Higher harmonics of Spin-orbit Torque in Noncentrosymmetric Weyl Semimetals
• The self-organized vacancy order in Pr${}_9$Ge${}_{16}$