Magneto-transport properties of proposed triply degenerate topological semimetal Pd$_{3}$Bi$_{2}$S$_{2}$

TL;DR

This study investigates the magneto-transport properties of Pd$_{3}$Bi$_{2}$S$_{2}$, a proposed topological semimetal, revealing large magnetoresistance, high charge carrier mobility, and potential for technological applications.

Contribution

The paper provides the first detailed experimental analysis of Pd$_{3}$Bi$_{2}$S$_{2}$'s transport properties, suggesting it as a new topological semimetal with unique electronic features.

Findings

Large, anisotropic, non-saturating magnetoresistance (~1100%) at 2 K and 9 T

Presence of two types of charge carriers with high mobility

Field-induced metal-semiconductor-like crossover at low temperatures

Abstract

We report transport properties of single-crystalline Pd$_{3}$Bi$_{2}$S$_{2}$, which has been predicted to host an unconventional electronic phase of matter beyond three-dimensional Dirac and Weyl semimetals. Similar to several topological systems, the resistivity shows field induced metal-semiconductor-like crossover at low temperature. Large, anisotropic and non-saturating magnetoresistance (MR) has been observed in transverse experimental configuration. At 2 K and 9 T, the MR value reaches as high as $\sim$1.1$\times$10$^{3}$ \%. Hall resistivity reveals the presence of two types of charge carriers and has been analyzed using two-band model. In spite of the large density ($>$ 10$^{21}$ cm$^{-3}$), the mobility of charge carriers is found to be quite high ($\sim$ 0.75$\times$10$^{4}$ cm$^{2}$ V$^{-1}$ s$^{-1}$ for hole and $\sim$ 0.3$\times$10$^{4}$ cm$^{2}$ V$^{-1}$ s$^{-1}$ for electron). The observed magneto-electrical properties indicate that Pd$_{3}$Bi$_{2}$S$_{2}$ may be a new member of the topological semimetal family, which can have a significant impact in technological applications.