Fermi surface of CePt2In7: A two-dimensional analog of CeIn3

Abstract

We report magnetic quantum oscillations in magnetic fields extending to $~$60 T in single crystals of the body-centered tetragonal antiferromagnet CePt${}_{2}$In${}_{7}$---recently discovered to exhibit pressure-induced superconductivity at ${T}_{\mathrm{c}}\ensuremath{\approx}$ 2.1 K. Despite the two-dimensionality of its Fermi surface, the microscopic electronic properties of layered CePt${}_{2}$In${}_{7}$ are revealed to be more similar to those of cubic CeIn${}_{3}$ than those of layered CeRhIn${}_{5}$. A significant field-induced change in the Fermi surface occurs below ${H}_{\mathrm{m}}\ensuremath{\approx}$ 45 T in both CePt${}_{2}$In${}_{7}$ and CeIn${}_{3}$, where it is broken into small pockets with field-dependent effective masses---signaling partial 4$f$-electron involvement in the Fermi surface for $H<{H}_{\mathrm{m}}$. Since CePt${}_{2}$In${}_{7}$ and CeIn${}_{3}$ differ only in the dimensionality of their Ce sublattices, an ideal pair of compounds for investigating the effect of dimensionality on superconductivity is realized.