# Magnetotransport properties of the triply degenerate node topological semimetal tungsten carbide

## TL;DR

This study investigates tungsten carbide's magnetotransport properties, revealing large quadratic magnetoresistance, negative longitudinal MR, and multiband behavior, positioning WC as a promising platform for exploring triply degenerate fermions in topological semimetals.

## Contribution

It provides experimental evidence of WC's unique magnetotransport features and confirms its status as a triply degenerate node topological semimetal.

## Key findings

- Large nonsaturating quadratic magnetoresistance at low temperatures
- Negative longitudinal MR observed along specific directions
- WC is a perfect compensated multiband semimetal

## Abstract

We report the magnetoresistance (MR), Hall effect, and de Haas-van Alphen (dHvA) effect studies of the single crystals of tungsten carbide, WC, which is predicted to be a new type of topological semimetal with triply degenerate nodes. With the magnetic field rotated in the plane perpendicular to the current, WC shows field induced metal to insulator like transition and large nonsaturating quadratic MR at low temperature. As the magnetic field parallel to the current, a pronounced negative longitudinal MR only can be observed when the current flows along the certain direction. Hall effect indicates WC is a perfect compensated semimetal, which may be related to the large nonsaturating quadratic MR. The analysis of dHvA oscillations reveals that WC is a multiband system with small cross-sectional areas of Fermi surface and light cyclotron effective masses. Our results indicate that WC is an ideal platform to study the recently proposed New Fermions with triply degenerate crossing points.