Electronic structure of YFe2Ge2 studied by angle-resolved photoemission spectroscopy
Abstract
We report an angle-resolved photoemission spectroscopy study of a ThCr2Si2 -type superconductor YFe2Ge2 (Tc≈1.8 K) in the normal state. The resolved low-energy band structure mainly consists of several flat Fe bands, while the renormalization factors of different bands range from 1.7 to 2.8. Around the Fermi level, these bands contribute to a high density of states, which may account for the unusually high Sommerfeld coefficient γ . Besides, a 30 meV kink is observed, which is probably induced by electron-phonon interactions. Our results indicate that YFe2Ge2 is a moderately correlated compound, while electron-phonon coupling should be taken into account to better understand its properties.
- Publication:
-
Physical Review B
- Pub Date:
- January 2016
- DOI:
- 10.1103/PhysRevB.93.024506
- Bibcode:
- 2016PhRvB..93b4506X