# de Haas-van Alphen measurement of the antiferromagnet URhIn$_5$

## TL;DR

This study uses de Haas-van Alphen measurements to explore the Fermi surface of the antiferromagnet URhIn$_5$, revealing multiple Fermi surface pockets and highlighting discrepancies with theoretical calculations, indicating complex electronic behavior.

## Contribution

First dHvA measurement of URhIn$_5$ revealing its Fermi surface topology and masses, showing the need for advanced calculations beyond simple LDA+SO.

## Key findings

- Fermi surface consists of four distinct pockets.
- Measured cyclotron masses range from 1.9 to 4.3 times the electron mass.
- Simple theoretical models do not match the experimental Fermi surface topology.

## Abstract

We report on the results of a de Haas-van Alphen (dHvA) measurement performed on the recently discovered antiferromagnet URhIn$_5$ ($T_N$ = 98 K), a 5\textit{f}-analogue of the well studied heavy fermion antiferromagnet CeRhIn$_5$. The Fermi surface is found to consist of four surfaces: a roughly spherical pocket $\beta$, with $F_\beta \simeq 0.3$ kT; a pillow-shaped closed surface, $\alpha$, with $F_\alpha \simeq 1.1$ kT; and two higher frequencies $\gamma_1$ with $F_{\gamma_1} \simeq 3.2$ kT and $\gamma_2$ with $F_{\gamma_2} \simeq 3.5$ kT that are seen only near the \textit{c}-axis, and that may arise on cylindrical Fermi surfaces. The measured cyclotron masses range from 1.9 $m_e$ to 4.3 $m_e$. A simple LDA+SO calculation performed for the paramagnetic ground state shows a very different Fermi surface topology, demonstrating a need for more advanced electronic structure calculations.