Quantum transport observed in films of magnetic topological semimetal EuSb$_2$

TL;DR

This paper reports the fabrication and quantum transport investigation of EuSb$_2$ films, revealing it as a magnetic topological nodal-line semimetal with surface state contributions, opening avenues for exploring exotic quantum phenomena.

Contribution

It demonstrates EuSb$_2$ as a magnetic topological semimetal with observable quantum oscillations in thin films, combining experimental fabrication with first-principles calculations.

Findings

EuSb$_2$ exhibits Shubnikov-de Haas oscillations with multiple frequencies.

The films show two-dimensional field-angle dependence, indicating surface states.

EuSb$_2$ is identified as a high-mobility magnetic topological semimetal.

Abstract

We report fabrication of EuSb$_2$ single-crystalline films and investigation of their quantum transport. First-principles calculations demonstrate that EuSb$_2$ is a magnetic topological nodal-line semimetal protected by nonsymmorphic symmetry. Observed Shubnikov-de Haas oscillations with multiple frequency components exhibit small effective masses and two-dimensional field-angle dependence even in a 250 nm thick film, further suggesting possible contributions of surface states. This finding of the high-mobility magnetic topological semimetal will trigger further investigation of exotic quantum transport phenomena by controlling magnetic order in topological semimetal films.