Impact of oxygen vacancies to control the magnetic and electronic properties of the La2CoMnO6 system

Abstract

The pervoskite oxygen vacancies have been accepted as essential functional defects and are effective in regulating their multifunctional properties. The bulk sample La2CoMnO6 (LCMO) was prepared by solid state routing and the film La2CoMnO6 by plus laser deposition (PLD). The samples phase purity was verified by means of X-ray diffraction measurement. It has been established from the core level of X-ray photoelectron spectroscopy that the concentration of Mn3+ ions increases, impairs the double exchange between Mn3+ and Mn4+ and thus leads to the degraded magnetic properties. A source of synchrotron radiation is used to analyze the valence band spectroscopy measurements from which, mainly as a result of oxygen vacancies, a huge change in the density of states (DOS) are observed near the Fermi level (EF). Such findings are related to records of resistivity and magnetization. Rutherford backscattering spectrometry (RBS) measurements were made using 2 MeV He2+ ions on the LCMO film and information regarding film thickness was extracted. These findings indicate that a dip in DOS at Fermi-level has slowed LCMO film conduction. It can be a result of changes in orbital hybridization due to oxygen vacancies that modify the octahedra of MnO6.