Weak antilocalization and Shubnikov–de Haas oscillations in single crystal CaCuSb

Quantum oscillations in both linear and Hall resistivities and weak antilocalization (WAL) are barely observed in bulk single crystals. Here we report the transport properties of a CaCuSb single crystal that crystallizes in the hexagonal crystal structure. The magnetotransport studies reveal WAL and Shubnikov-de Haas (SdH) quantum oscillations with a unique frequency at 314 T. A cusplike behavior in the low-field regime of magnetotransport for J∥(ab)-plane and B∥[0001] confirms the WAL in CaCuSb. Angular-dependent normalized magnetoconductance and SdH oscillations studies reveal that the observed phenomena originate from the 2D transport channels. The high magnetic-field (up to 45 T) experiments demonstrate plateaulike features in the Hall measurements. The first-principles calculations unfold that CaCuSb is a nontopological semimetal with dominant hole carriers at the Fermi level. Our study reveals that CaCuSb is a promising candidate to explore the quasi-2D quantum transport phenomenon in the transition metal pnictide materials.