2006/05/01 by Yoshiki Imai, Masatoshi Imada · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Transition Metal Oxide Nanomaterials #cond-mat.str-el
paper · pdf · doi:10.1143/jpsj.75.094713
published as J. Phys. Soc. Jpn. 75 (2006) 094713 · 38pages, 22figures
arxiv created 2006/05/01 · openalex publication_date 2006/09/11 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Combining first-principles calculations with a technique for many-body problems, we investigate properties of the transition metal oxide \rm Sr2VO4 from the microscopic point of view. By using the local density approximation (LDA), the high-energy band structure is obtained, while screened Coulomb interactions are derived from the constrained LDA and the GW method. The renormalization of the kinetic energy is determined from the GW method. By these downfolding procedures, an effective Hamiltonian at low energies is derived. Applying the path integral renormalization group method to this Hamiltonian, we obtain ground state properties such as the magnetic and orbital orders. Obtained results are consistent with experiments within available data. We find that \rm Sr2VO4 is close to the metal-insulator transition. Furthermore, because of the coexistence and competition of ferromagnetic and antiferromgnetic exchange interactions in this system, an antiferromagnetic and orbital-ordered state with a nontrivial and large unit cell structure is predicted in the ground state. The calculated optical conductivity shows characteristic shoulder structure in agreement with the experimental results. This suggests an orbital selective reduction of the Mott gap.