Mass Enhancement Factor and Fermi Surface in YCo_2

Abstract

An FLAPW electronic structure and Fermi surfaces are calculated for YCo₂.Mass enhancement factor is also calculated based on the Fermi liquid theory.Investigations are performed by treating the Fermi energy as a parameteraccording to a previous study.Reasonable mass enhancement is obtained by assuming the Fermi liquidtheory resulting in a reasonable range of values of U_dd for Co-d electrons.The same calculation for CeCo₂ reveals that CeCo₂ is a differentmagnetic system.