# Magnetotransport in Al6Re

## TL;DR

This study investigates the magnetotransport properties of the Type-I superconductor Al6Re, revealing a highly anisotropic Fermi surface and potential signs of nontrivial band topology through quantum oscillation analysis.

## Contribution

It provides the first detailed magnetotransport characterization of Al6Re, highlighting its anisotropic Fermi surface and possible nontrivial band topology features.

## Key findings

- Highly anisotropic Fermi surface with dominant hole character
- Quantum oscillations suggest possible nontrivial band topology
- Landau index intercept near 1/4 indicating complex band structure

## Abstract

Since very few Type-I superconductors are known and most are elemental superconductors, there are very few experimental platforms where the interaction between Type-I superconductivity and topologically nontrivial band structure can be probed. The rhenium aluminide Al$_6$Re has recently been identified as a Type-I superconductor with a transition of 0.74\,K and a critical field of $\sim$50\,Oe. Here, we report its magnetotransport behavior including de Haas-van Alphen (dHvA) and Shubnikov-de Haas (SdH) oscillations. Angular dependence of the magnetoresistance reveals a highly anisotropic Fermi surface with dominant hole character. From the strong oscillatory component $\Delta R_{xx}$ in high magnetic fields up to 33\,T, the Landau index infinite-field intercept in the case of a single oscillation frequency, and the phase factor $\varphi$ where multiple frequencies coexist, are both $\sim$1/4. This intermediate value is suggestive of possible nontrivial band topology but does not allow strong conclusions.