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

TL;DR

This study investigates the quantum transport phenomena in CaCuSb single crystals, revealing weak antilocalization and quantum oscillations indicative of quasi-2D transport channels, with potential for exploring novel quantum effects.

Contribution

The paper reports the first observation of WAL and SdH oscillations in CaCuSb, demonstrating its quasi-2D transport properties and non-topological semimetal nature.

Findings

WAL observed with cusp-like behavior in low fields

SdH oscillations with a frequency of 314 T

CaCuSb identified as a non-topological semimetal

Abstract

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 cusp-like 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 plateau-like features in the Hall measurements. The first-principles calculations unfold that CaCuSb is a non-topological semimetal with dominant hole carries 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.