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

TL;DR

This study investigates the Fermi surface properties of CePt$_2$In$_7$ using de Haas-van Alphen measurements, revealing quasi-two-dimensional Fermi surfaces and localized $f$ electrons, with implications for understanding its electronic structure.

Contribution

The paper provides experimental evidence of localized $f$ electrons in CePt$_2$In$_7$ through quantum oscillation measurements and band structure comparisons, advancing knowledge of its electronic behavior.

Findings

Observation of quasi-2D Fermi surfaces above 35 T

Fermi surface features similar to those in LaPt$_2$In$_7$ and PrPt$_2$In$_7$

Moderately enhanced effective masses from 2$m_0$ to 6$m_0$

Abstract

We report measurements of the de Haas-van Alphen effect in the layered heavy-fermion compound CePt$_2$In$_7$ 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$_2$In$_7$ and LaPt$_2$In$_7$, and the comparison suggests localized $f$ electrons in CePt$_2$In$_7$. This conclusion is further supported by comparing experimentally observed Fermi surfaces in CePt$_2$In$_7$ and PrPt$_2$In$_7$, which are found to be almost identical. The measured effective masses in CePt$_2$In$_7$ are only moderately enhanced above the bare electron mass $m_0$, from 2$m_0$ to 6$m_0$.