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X-ray photoemission studies of Zn doped Cu1-xTlxBa2Ca2Cu 3-yZnyO10-δ (y = 0, 2.65) superconductors
, Article Physica C: Superconductivity and its Applications ; Volume 453, Issue 1-2 , 2007 , Pages 46-51 ; 09214534 (ISSN) ; Mumtaz, M ; Ahadian, M. M ; Iraji zad, A ; Sharif University of Technology
2007
Abstract
The X-ray photoemission (XPS) measurements of Cu1-xTlxBa2Ca2 Cu3-yZnyO10-δ (y = 0, 2.65) superconductors have been performed and compared. These studies revealed that the charge state of thallium in the Cu0.5Tl0.5Ba2O4-δ charge reservoir layer in Zn doped samples is Tl1+, while it is a mix of Tl1+ and Tl2+ in Zn free samples. The binding energy of Ba atoms in the Zn doped samples is shifted to higher energy, which when considered along with the presence of Tl1+ suggested that it more efficiently directed the carriers to ZnO2 and CuO2 planes. The evidence of improved inter-plane coupling witnessed in X-ray diffraction is also confirmed by XPS measurements of Ca atoms in the Zn doped samples....
Electron correlation in Sr(Ca)RuO 3 by GWA and LSDA+U
, Article European Physical Journal B ; Volume 84, Issue 2 , November , 2011 , Pages 203-217 ; 14346028 (ISSN) ; Akhavan, M ; Sharif University of Technology
2011
Abstract
We have investigated the role of electron-electron correlation in SrRuO 3 and CaRuO 3 bulk structures. At first, the DOS of SrRuO 3 and CaRuO 3 is obtained using the full potential linearized augmented plane wave method by LSDA. We have then calculated the electronic structure, dielectric function, self-energy, and spectral function for the bulk SrRuO 3 and CaRuO 3 by GWA. The shifting of the Ru t 2g orbitals, broadening in Ru valance bands, and also the enhancement in exchange splitting shows better agreement between the GWA many-body correction with the bulk experimental results. But, in spite of the many-body correction, the GWA results is not completely consistent with the PES...