Electronic structure of epitaxial SrRuO3 films studied by resonant photoemission

Abstract

a b s t r a c tThe electronic structure of epitaxial SrRuO 3 thin films annealed at 300 1C in ultra high vacuum is studied by resonant photoemission spectroscopy using synchrotron radiation. The valence band photoemission spectra show a good agreement with theoretical band structure calculations indicating a good quality of the film surface. A method was proposed, which allows extracting the partial density of states in the case of weak and broad resonance. The Ru 4d spectral weights obtained experimentally are in a very good agreement with theoretical predictions, confirming a strong mixing between Ru 4d and O 2p states, as well as the signature of electron correlation near the Fermi level in SrRuO 3 .

Ab initioand photoemission study of correlation effects in SrRuO3thin films

“…In Ref. 17, the two methods for evaluation of Ru 4d partial spectral weight (PSW) were reviewed. One of them uses photoemission measurements in a photon energy range covering the Ru 4p → 4d resonance, 14 while the other is based on the Cooper minimum phenomenon of the Ru 4d photoionization cross section.…”

Charge screening effects in the resonant photoemission of Rh2O3, RuO2 , and MoO2Stoeberl1, Guedes2, Abbate3 et al. 2020Phys. Rev. B1000View full textAdd to dashboardCite

“…[14]. In this paper, q is given in terms of the photoemission dipole p|r|4d and f |r|4d matrix elements, the absorption dipole 4d|r|2p matrix element, and the Auger R 1,3 (2p, p; 4d, 4d ) and R 1,3 (2p, f ; 4d, 4d ) integrals, which were calculated here using the code by Cowan [40]. These are, in turn, presented in Table III.…”

“…Resonant photoemission spectroscopy (RPES) is a powerful technique to study the electronic structure of transitionmetal oxides (TMO's) [1][2][3][4]. In principle, it allows one to identify and decompose the O 2p and transition-metal (TM) d partial contributions to the valence band (VB) of a given system, which are usually heavily mixed.…”