Bulk and surface sensitive high-resolution photoemission study of Mott–Hubbard systems SrVO3 and CaVO3
We study the electronic structure of Mott-Hubbard systems SrVO 3 and CaVO 3 with bulk and surface sensitive high-resolution photoemission spectroscopy using low-energy photons (hv = 7-21 eV), including a VUV laser. A clear suppression of the density of states within ∼0.2eV of the Fermi level (E F ) is found. The coherent band in SrVO 3 and CaVO 3 is shown to consist of surface and bulk-derived features. The results indicate that the stronger distortion on the surface of CaVO 3 compared to SrVO 3 is directly reflected in the coherent DOS at E F , consistent with recent theory.
We consider the cross area of the PP_ and PSV_wave window as the best window for joint PP_ and PSV_wave acquisition in VTI media. Within the effective window, the PP_ and PSV_wave's raypathes and phase angles at all reflection points are calculated, and the reflection (or transmission) coefficients' ratios of PSV- to PP_wave solved from Zoeppritz equations are defined as the controlling factor G. Then we use G values as the main controlling parameters of joint PP_ and PSV_wave acquisition design in VTI media, determine the best receiving window of detectors by analyzing G values, and derive the method of optimizing the receiving window for acquisition of multi_component converted seismic data in VTI media.