Flat Bands at the Fermi Level in Unconventional Superconductor YFe2Ge2

R. Kurleto, C. -H. Wu, S. Acharya +15

We report heavy electron behavior in unconventional superconductor YFe${}_2$Ge${}_2$ ($T_C=1.2$ K). We directly observe very heavy bands ($m_{\mathrm{eff}}\sim 25m_e$) within $\…