부산대학교 도서관

We report measurements of the de Haas-van Alphen effect in the layered heavy-fermion compound CePt2 In7 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 CePt2 In7 and LaPt 2 In 7, and the comparison suggests localized f electrons in CePt2 In7. This conclusion is further supported by comparing experimentally observed Fermi surfaces in CePt2 In7 and PrPt 2 In 7, which are found to be almost identical. The measured effective masses in CePt2 In7 are only moderately enhanced above the bare electron mass m0, from 2 m0 to 6m0. [ABSTRACT FROM AUTHOR]