Electronic Structure of Sr₃Ru₂O₇

Abstract

The electronic energy band structure for Sr₃Ru₂O₇, which is related to the superconducting Sr₂RuO₄ and whose structure is called double-layered structure, has been calculated by using the scalar-relativistic full-potential linearized augmented plane wave (FLAPW) method within the local-density approximation in the paramagnetic case. The result of the calculation suggests that this compound is a metal and its electronic structure looks like that of Sr₂RuO₄. However, we found one of the Fermi surfaces has a large dispersion along k_z axis. The calculated large density of states at the Fermi energy indicates that Sr₃Ru₂O₇ may have a ferromagnetic ground state.