We report quantum oscillation measurements on the kagome compounds ${\mathrm{ATi}}_3{\mathrm{Bi}}_5$ (A=Rb, Cs) in magnetic fields up to 41.5 T and temperatures down to 350 mK. In addition to the frequencies observed in previous studies, we have observed multiple unreported frequencies above 2000 T in ${\mathrm{CsTi}}_3{\mathrm{Bi}}_5$ using a tunnel diode oscillator technique. We compare these results against density functional theory calculations and find good agreement with the calculations in the number of peaks observed, frequency, and the dimensionality of the Fermi surface. For ${\mathrm{RbTi}}_3{\mathrm{Bi}}_5$ we have obtained a different quantum oscillation spectrum, although calculated quantum oscillation frequencies for the Rb compound are remarkably similar to the Cs compound, calling for further studies.

• Received 28 November 2023
• Accepted 22 January 2024

DOI:https://doi.org/10.1103/PhysRevMaterials.8.024003