Quantum oscillations and Dirac dispersion in the BaZnBi2 semimetal guaranteed by local Zn vacancy order

Abstract

We have synthesized single crystals of Dirac semimetal candidates AZnBi2 with A=Ba and Sr. In contrast to A=Sr, the Ba material displays a novel local Zn vacancy ordering, which makes the observation of quantum oscillations in out-of-plane magnetic fields possible. As a new Dirac semimetal candidate, BaZnBi2 exhibits small cyclotron electron mass, high quantum mobility, and non-trivial Berry phases. Three Dirac dispersions are observed by ARPES and identified by first- principles band-structure calculations. Compared to AMn(Bi/Sb)2 systems which host Mn magnetic moments, BaZnBi2 acts as non-magnetic analogue to investigate the intrinsic properties of Dirac fermions in this structure family.

arXiv commentTo be published in PRB

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Cited by in corpus (10)

• Topological Semimetals in Square-Net Materials
• A systematic study of stacked square nets: from Dirac fermions to material realizations
• Magnetic mixed valent semimetal EuZnSb${}_2$ with Dirac states in the band structure
• A de Hass-van Alphen study of the Type-II Dirac semimetal candidates $A$Te${}_2$ ($A=$ Pt, Pd)
• Crystal growth, microstructure and physical properties of SrMnSb${}_2$
• Non-trivial topology in a layered Dirac nodal-line semimetal candidate SrZnSb${}_2$ with distorted Sb square nets
• Magnetic tuning of band topology evidenced by exotic quantum oscillations in the Dirac semimetal EuMnSb${}_2$
• Coexistence of Dirac fermion and charge density wave in square-net-based semimetal LaAuSb2
• Massive Dirac fermions in layered BaZnBi${}_2$
• Interplay of short-range bond order and A-type antiferromagnetic order in metallic triangular lattice GdZn${}_3$P${}_3$