First-principle calculation on the structural stability of CeAg

The structural stability of CeAg has been studied by self-consistent full-potential linearized augmented plane wave method (FP_LAPW) based on the density functional theory (DFT). The result shows that the low-temperature phase of CeAg is not a simple tetragonal structure. The degenerate d states at the Fermi level are split because of atomic shifts, which result in the cubic-to-tetragonal transition.