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Possible Weyl fermions in the magnetic Kondo system CeSb

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Steglich,  Frank
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Guo, C., Cao, C., Smidman, M., Wu, F., Zhang, Y., Steglich, F., et al. (2017). Possible Weyl fermions in the magnetic Kondo system CeSb. npj Quantum Materials, 2: 39, pp. 1-6. doi:10.1038/s41535-017-0038-3.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-D7DB-8
Abstract
Materials where the electronic bands have unusual topologies allow for the realisation 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.