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We report measurements of the de Haas-van Alphen effect in the layeredheavy-fermion compound CePt$_2$In$_7$ in high magnetic fields up to 35 T. Abovean angle-dependent threshold field, we observed several de Haas-van Alphenfrequencies originating from almost ideally two-dimensional Fermi surfaces. Thefrequencies are similar to those previously observed to develop only above amuch higher field of 45 T, where a clear anomaly was detected and proposed tooriginate from a change in the electronic structure [M. M. Altarawneh et al.,Phys. Rev. B 83, 081103 (2011)]. Our experimental results are compared withband structure calculations performed for both CePt$_2$In$_7$ andLaPt$_2$In$_7$, and the comparison suggests localized $f$ electrons inCePt$_2$In$_7$. This conclusion is further supported by comparingexperimentally observed Fermi surfaces in CePt$_2$In$_7$ and PrPt$_2$In$_7$,which are found to be almost identical. The measured effective masses inCePt$_2$In$_7$ are only moderately enhanced above the bare electron mass $m_0$,from 2$m_0$ to 6$m_0$.

Quasi-two-dimensional Fermi surfaces with localized $f$ electrons in the layered heavy-fermion compound CePt$_2$In$_7$