Possible Weyl fermions in the magnetic Kondo system CeSb

Abstract

Materials where the electronic bands have unusual topologies allow for the realization of novel physics and have a wide range of potential applications. When two electronic bands with linear dispersions intersect at a point, the excitations could be described as Weyl fermions which are massless particles with a particular chirality. Here we report evidence for the presence of Weyl fermions in the ferromagnetic state of the low-carrier density, strongly correlated Kondo lattice system CeSb, from electronic structure calculations and angle-dependent magnetoresistance measurements. When the applied magnetic field is parallel to the electric current, a pronounced negative magnetoresistance is observed within the ferromagnetic state, which is destroyed upon slightly rotating the field away. These results give evidence for CeSb belonging to a new class of Kondo lattice materials with Weyl fermions in the ferromagnetic state.

arXiv comment18 pages, 4 figures, Supplementary Information available from journal link (open access)

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• Tunable Electronic Structure and Topological Properties of $LnPn$ ($Ln$=Ce, Pr, Gd, Sm, Yb; $Pn$=Sb, Bi)
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• Separation of Electron and Hole Dynamics in the Semimetal LaSb
• Tunable Electronic Structure and Surface States in Rare Earth Mono-Bismuthides with Partially Filled f Shell
• Extremely large magnetoresistance and Fermi surface topology of PrSb
• Unusual magnetotransport in holmium monoantimonide
• From Trivial Kondo Insulator Ce${}_3$Pt${}_3$Bi${}_4$ to Topological Nodal-line Semimetal Ce${}_3$Pd${}_3$Bi${}_4$
• Rare-earth monopnoctides -- family of antiferromagnets hosting magnetic Fermi arcs
• Unusual change in the Dirac-cone energy band upon two-step magnetic transition in CeBi
• Anomalous quantum oscillations and evidence for a non-trivial Berry phase in SmSb
• Pr${}_2$Ir${}_2$O${}_7$: when Luttinger semimetal meets Melko-Hertog-Gingras spin ice state
• Orbital-flop Induced Magnetoresistance Anisotropy in Rare Earth Monopnictide CeSb
• Magnetic-field-induced nontrivial electronic state in the Kondo-lattice semimetal CeSb
• Strong and Tunable Electrical-Anisotropy in Type-II Weyl Semimetal Candidate WP2 with Broken Inversion Symmetry
• Observation of gapped state in rare-earth monopnictide HoSb
• Complex electronic structure evolution of NdSb across the magnetic transition
• Bulk band inversion and surface Dirac cones in LaSb and LaBi : Prediction of a new topological heterostructure
• Directional effects of antiferromagnetic ordering on the electronic structure in NdSb
• Evidence of non-trivial Berry phase and Kondo physics in SmBi
• Kondo behavior and metamagnetic phase transition in a heavy fermion compound CeBi2
• Behavior of gapped and ungapped Dirac cones in an antiferromagnetic topological metal, SmBi
• Prediction of Spin Polarized Fermi Arcs in Quasiparticle Interference of CeBi
• Quantum transport in a compensated semimetal W2As3 with nontrivial Z2 indices
• Pressure effect on the topologically nontrivial electronic state and transport of lutecium monobismuthide
• Origin of the exotic electronic states in antiferromagnetic NdSb
• Unconventional Surface State Pairs in a High-Symmetry Lattice with Anti-ferromagnetic Band-folding
• Spin-polarized imaging of strongly interacting fermions in the ferrimagnetic state of Weyl candidate CeBi
• Extremely large magnetoresistance and compensated Fermi surfaces in the antiferromagnetic semimetal YbAs
• Electronic structure and open-orbit Fermi surface topology in isostructural semimetals NbAs${}_2$ and W${}_2$As${}_3$ with extremely large magnetoresistance
• Node-line Dirac semimetal manipulated by Kondo mechanism in nonsymmorphic CePt${}_2$Si${}_2$
• Unexpected changes in the band structure within AFM1 state of CeBi
• Long-range magnetic order induced surface state in GdBi and DyBi
• Weyl Fermion with various chiralities in a f-electron ferromagnetic system: PrB4
• Weyl nodes and Kondo interaction in noncentrosymmetric semimetals RGaGe (R=La, Ce and Pr) with long Fermi arcs
• Cubic Dirac Semimetals: General Theory and Application to Rare-Earth Magnets
• Spin-orbital order and excitons in magnetoresistive HoBi
• CeAu${}_2$Bi: a new nonsymmorphic antiferromagnetic compound