Quantum oscillation measurements can provide important information about the Fermi surface (FS) properties of strongly correlated metals. Here, we report a Shubnikov-de Haas (SdH) effect study on the pnictide parent compounds EuFe2As2 (Eu122) and BaFe2As2 (Ba122) grown by In-flux. Although both members are isovalent compounds with approximately the same density of states at the Fermi level, our results reveal subtle changes in their fermiology. Eu122 displays a complex pattern in the Fourier spectrum, with band splitting, magnetic breakdown orbits, and effective masses sistematically larger when compared to Ba122, indicating that the former is a more correlated metal. Moreover, the observed pockets in Eu122 are more isotropic and 3D-like, suggesting an equal contribution from the Fe 3d orbitals to the FS. We speculate that these FS changes may be responsible for the higher spin-density wave ordering temperature in Eu122.
@article{arxiv.1402.2412,
title = {Quantum Oscillations in EuFe2As2 single crystals},
author = {P. F. S. Rosa and B. Zeng and C. Adriano and T. M. Garitezi and T. Grant and Z. Fisk and L. Balicas and R. R. Urbano and P. G. Pagliuso},
journal= {arXiv preprint arXiv:1402.2412},
year = {2015}
}