Quasi-two-dimensional Fermi surfaces with localized f electrons in the layered heavy-fermion compound CePt₂In₇

We report measurements of the de Haas–van Alphen effect in the layered heavy-fermion compound CePt₂In₇ in high magnetic fields up to 35 T. Above an angle-dependent threshold field, we observed several de Haas–van Alphen frequencies originating from almost ideally two-dimensional Fermi surfaces. The frequencies are similar to those previously observed to develop only above a much higher field of 45 T, where a clear anomaly was detected and proposed to originate from a change in the electronic structure [M. M. Altarawneh et al., Phys. Rev. B 83, 081103 (2011)]. Our experimental results are compared with band structure calculations performed for both CePt₂In₇ and LaPt₂In₇, and the comparison suggests localized f electrons in CePt₂In₇. This conclusion is further supported by comparing experimentally observed Fermi surfaces in CePt₂In₇ and PrPt₂In₇, which are found to be almost identical. The measured effective masses in CePt₂In₇ are only moderately enhanced above the bare electron mass m₀, from 2m₀ to 6m₀.