Unraveling the origin of Kondo-like behavior in the 3<i>d</i>-electron heavy-fermion compound YFe₂Ge₂.

ABSTRACT: The heavy fermion (HF) state of [Formula: see text]-electron systems is of great current interest since it exhibits various exotic phases and phenomena that are reminiscent of the Kondo effect in [Formula: see text]-electron HF systems. Here, we present a combined infrared spectroscopy and first-principles band structure calculation study of the [Formula: see text]-electron HF compound YFe[Formula: see text]Ge[Formula: see text]. The infrared response exhibits several charge-dynamical hallmarks of HF and a corresponding scaling behavior that resemble those of the [Formula: see text]-electron HF systems. In particular, the low-temperature spectra reveal a dramatic narrowing of the Drude response along with the appearance of a hybridization gap ([Formula: see text] 50 meV) and a strongly enh

SUBMITTER: Xu B 

PROVIDER: S-EPMC11441551 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature