Correlated Electrons and Mass Enhancement on the β-Mn Type Lattice

Electronic structure and electron correlations of the Hubbard model on β-Mn lattice have been investigated basis momentum dependent local ansatz wavefunction method. It is found that electrons are significantly correlated as compared with those face centered cubic (fcc) body (bcc) lattices; correlation energy gain largest among β-Mn, fcc, bcc structures, charge fluctuations show a significant suppression. In particular, it mass enhancement factor shows large peak around number per atom n = 1.1 when varied at typical Coulomb interaction strength transition metals. pointed may explain anomalous electronic specific heat coefficient in β-Mn.