Quasi-two-dimensional Fermi surfaces with localized f electrons in the layered heavy-fermion compound CePt_2In_7

摘要

We report measurements of the de Haas-van Alphen effect in the layered heavy-fermion compound CePt_2In_7 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 CePt_2In_7 and LaPt_2In_7, and the comparison suggests localized / electrons in CePt_2In_7. This conclusion is further supported by comparing experimentally observed Fermi surfaces in CePt_2In_7 and PrPt_2In_7, which are found to be almost identical. The measured effective masses in CePt_2In_7 are only moderately enhanced above the bare electron mass m_0, from 2m_0 to 6m_0.