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

We report magnetic quantum oscillations in magnetic fields extending to ∼60 T in single crystals of the body-centered tetragonal antiferromagnet CePt2In7--recently discovered to exhibit pressure-induced superconductivity at Tc≈ 2.1 K. Despite the two-dimensionality of its Fermi surface, the microscopic electronic properties of layered CePt2In7 are revealed to be more similar to those of cubic CeIn3 than those of layered CeRhIn5. A significant field-induced change in the Fermi surface occurs below Hm≈ 45 T in both CePt2In7 and CeIn3, where it is broken into small pockets with field-dependent effective masses-signaling partial 4f-electron involvement in the Fermi surface for H<Hm. Since CePt2In7 and CeIn3 differ only in the dimensionality of their Ce sublattices, an ideal pair of compounds for investigating the effect of dimensionality on superconductivity is realized. [ABSTRACT FROM AUTHOR]