The Fermi surface of CePt$_{2}$In$_{7}$: a two-dimensional analog of CeIn$_{3}$

We report magnetic quantum oscillations in magnetic fields extending to $\sim$60 T in single crystals of the body-centered tetragonal antiferromagnetic CePt$_{2}$In$_{7}$ recently discovered to exhibit pressure- induced superconductivity at $T_{c}$ = 2.1 K. Despite two-dimensionality of its Fermi surface, the microscopic electronic properties of layered CePt$_{2}$In$_{7}$ are revealed to be more similar to cubic CeIn$_{3}$ than layered CeRhIn$_{5}$. A significant field-induced change in the Fermi surface occurs at $H_{m}$ around 45 T in both CePt$_{2}$In$_{7}$ and CeIn$_{3}$, below which it is broken into small pockets with field-dependent effective masses -signaling 4f-electron involvement in the Fermi surface for $H < H_{m}$. Our findings suggest that CePt$_{2}$In$_{7}$ and CeIn$_{3}$ differ solely by the dimensionality of their Ce sublattices, thus realizing an ideal pair of compounds for investigating the effect of dimensionality on boosting superconductivity.