de Haas-van Alphen measurement of the antiferromagnet URhIn$_5$
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 $β$, with $F_β\simeq 0.3$ kT; a pillow-shaped closed surface, $α$, with $F_α\simeq 1.1$ kT; and two higher frequencies $γ_1$ with $F_{γ_1} \simeq 3.2$ kT and $γ_2$ with $F_{γ_2} \simeq 3.5$ 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.