Dirac Fermions and Possible Weak Antilocalization in LaCuSb${}_2$

Abstract

Layered heavy-metal square-lattice compounds have recently emerged as potential Dirac fermion materials due to bonding within those sublattices. We report quantum transport and spectroscopic data on the layered Sb square-lattice material LaCuSb${}_2$. Linearly dispersing band crossings, necessary to generate Dirac fermions, are experimentally observed in the electronic band structure observed using angle-resolved photoemission spectroscopy (ARPES), along with a quasi-two-dimensional Fermi surface. Weak antilocalization that arises from two-dimensional transport is observed in the magnetoresistance, as well as regions of linear dependence, both of which are indicative of topologically non-trivial effects. Measurements of the Shubnikov-de Haas (SdH) quantum oscillations show low effective mass electrons on the order of 0.065$m_e$, further confirming the presence of Dirac fermions in this material.

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Cited by in corpus (10)

• The role of delocalized chemical bonding in square-net-based topological semimetals
• Electronic band structure and surface states in Dirac semimetal LaAgSb${}_2$
• Weak antilocalization effect and triply degenerate state in Cu-doped CaAuAs
• Exotic rare earth-based materials for emerging spintronic technology
• Successive destruction of charge density wave states by pressure in LaAgSb${}_2$
• Mesoscopic transport signatures of disorder-induced non-Hermitian phases
• Coexistence of Dirac fermion and charge density wave in square-net-based semimetal LaAuSb2
• Phonon-mediated superconductivity in the Sb-square-net compound LaCuSb${}_2$
• Magnetotransport Properties of Square-Net Compounds of NbSiSb and NbGeSb Single Crystals
• Fragile superconductivity in a Dirac metal