Lifshitz transition from valence fluctuations in YbAl₃.

ABSTRACT: In mixed-valent Kondo lattice systems, such as YbAl₃, interactions between localized and delocalized electrons can lead to fluctuations between two different valence configurations with changing temperature or pressure. The impact of this change on the momentum-space electronic structure is essential for understanding their emergent properties, but has remained enigmatic. Here, by employing a combination of molecular beam epitaxy and in situ angle-resolved photoemission spectroscopy we show that valence fluctuations can lead to dramatic changes in the Fermi surface topology, even resulting in a Lifshitz transition. As the temperature is lowered, a small electron pocket in YbAl₃ becomes completely unoccupied while the low-energy ytterbium (Yb) 4f states become increasi

SUBMITTER: Chatterjee S 

PROVIDER: S-EPMC5636910 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature