# Magnetotransport and Magneto-Thermoelectric Properties of the Nodel-Line Semimetal SnTaS2

## TL;DR

This study explores the electronic transport properties of SnTaS2, a topological semimetal, revealing unique behaviors linked to its nontrivial band structure.

## Contribution

The paper provides new insights into the interplay between topology and transport in SnTaS2 through detailed magnetotransport and magneto-thermoelectric measurements.

## Key findings

- Large magnetoresistance and nonlinear Hall resistivity observed in SnTaS2 at low temperatures.
- Quantum oscillations with a single frequency detected, indicating a small effective mass and nontrivial Berry phase.

## Abstract

Topological semimetals with nontrivial band structures host a variety of unconventional transport phenomena and have attracted significant attention in condensed matter physics. SnTaS2, a recently proposed topological nodal-line superconductor with a centrosymmetric layered structure, provides an ideal platform to explore the interplay between topology and electronic transport. Here, we report a comprehensive study of the normal-state magnetotransport and magneto-thermoelectric properties of SnTaS2 single crystals. We observed large magnetoresistance and nonlinear Hall resistivity at low temperatures, which can be well described by a two-band model, indicating the coexistence of electron and hole carriers. The Seebeck and Nernst coefficients were found to exhibit pronounced and nonmonotonic magnetic field dependences at low temperatures, consistent with multiband transport behavior. Moreover, clear quantum oscillations with a single frequency are detected in both electrical and thermoelectric measurements. Analysis of the oscillations reveals a small effective mass and a nontrivial Berry phase, suggesting that the corresponding Fermi surface arises from a topologically nontrivial band. These findings shed light on the normal-state electronic structure of SnTaS2 and highlight the important role of topological bands in shaping its transport properties.