Quantum oscillation measurements in the new unconventional superconductor YFe2Ge2 resolve all four Fermi surface pockets expected from band structure calculations, which predict an electron pocket in the Brillouin zone corner and three hole pockets enveloping the centers of the top and bottom of the Brillouin zone. The carrier masses are uniformly renormalized by about a factor of five and broadly account for the enhanced heat capacity Sommerfeld coefficient ≃100 mJ/molK2. Our data highlight the key role of the electron pocket, which despite its small volume accounts for about half the total density of states, and point towards a predominantly local mechanism underlying the mass renormalization in YFe2Ge2.
@article{arxiv.2104.11791,
title = {Fermi surface and mass renormalization in the iron-based superconductor YFe$_2$Ge$_2$},
author = {Jordan Baglo and Jiasheng Chen and Keiron Murphy and Roos Leenen and Alix McCollam and Michael L. Sutherland and F. Malte Grosche},
journal= {arXiv preprint arXiv:2104.11791},
year = {2022}
}