2013/08/31 by Hiroki Wadati, H. Wadati, K. Yoshimatsu +18 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Angle-resolved photoemission spectroscopy #Condensed matter physics #Density functional theory #Electron #Electronic and Structural Properties of Oxides #Electronic structure #Inverse photoemission spectroscopy #Local-density approximation #Magnetic and transport properties of perovskites and related materials #Photoemission spectroscopy #Physics #Quantum mechanics #Quasiparticle #Renormalization #Spectral line #Strongly correlated material #Superconductivity #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.90.205131
published as Phys. Rev. B 90, 205131 (2014) · 8 pages, 7 figures
arxiv created 2014/01/24 · openalex publication_date 2014/11/20 · arxiv updated 2014/11/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We investigate the electronic structure of a perovskite-type Pauli paramagnet SrMoO3 (t2g2) thin film using hard x-ray photoemission spectroscopy and compare the results to realistic calculations that combine density functional theory within the local-density approximation (LDA) with dynamical mean-field theory (DMFT). Despite the clear signature of electron correlations in the electronic specific heat, the narrowing of the quasiparticle bands is not observed in the photoemission spectrum. This is explained in terms of the characteristic effect of Hund's rule coupling for partially filled t2g bands, which induces strong quasiparticle renormalization already for values of Hubbard interaction which are smaller than the bandwidth. This interpretation is supported by DMFT model calculations including Hund's rule coupling, which show a renormalization of low-energy quasiparticles without affecting the overall bandwidth. The photoemission spectra show additional spectral weight around \ensuremath-2.5 eV that is not present in the LDA+DMFT results, pointing to a source of correlations that is not present in our calculations that include only on-site interactions. We interpret this weight as a plasmon satellite, which is supported by the measured core-level spectra that all show satellites at this energy.