Quasi-two-dimensional Dirac fermions and quantum magnetoresistance in LaAgBi${}_2$

Abstract

We report quasi-two-dimensional Dirac fermions and quantum magnetoresistance in LaAgBi${}_2$. The band structure shows several narrow bands with nearly linear energy dispersion and Dirac-cone-like points at the Fermi level. The quantum oscillation experiments revealed one quasi-two-dimensional Fermi pocket and another complex pocket with small cyclotron resonant mass. The in-plane transverse magnetoresistance exhibits a crossover at a critical field $B^{\ast }$ from semiclassical weak-field $B^2$ dependence to the high-field unsaturated linear magnetoresistance which is attributed to the quantum limit of the Dirac fermions. Our results suggest the existence of quasi 2D Dirac fermions in rare-earth based layered compounds with two-dimensional double-sized Bi square nets, similar to (Ca,Sr)MnBi${}_2$, irrespective of magnetic order.

arXiv comment7 pages, 7 figures. arXiv admin note: text overlap with arXiv:1204.1333

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• Dirac and Weyl Semimetal in XYBi (X=Ba, Eu; Y=Cu, Ag and Au)
• Detailed study on the Fermi surfaces of the type-II Dirac semimetallic candidates PdTe2 and PtTe2
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• Correlated materials design: prospects and challenges
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• Low Temperature metamagnetism and Hall effect anomaly in Kondo compound CeAgBi2
• Quantum oscillation evidence of topological semimetal phase in ZrSnTe
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• Dirac Fermions and Possible Weak Antilocalization in LaCuSb${}_2$
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• Interwoven atypical quantum states in CeLiBi${}_2$
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• Observation of quantum oscillations, linear magnetoresistance, and crystalline electric field effect in quasi-two-dimensional PrAgBi${}_2$
• Quasi-linear magnetoresistance and paramagnetic singularity in Hypervalent Bismuthide
• Magnetization and magneto-transport measurements on CeBi single crystals