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Enhanced inter-plane coupling of Mg doped Cu0.5Tl0.5Ba2Ca2- xMgxCu3O10-δ superconductors: XPS and FTIR studies
, Article Physica C: Superconductivity and its Applications ; Volume 468, Issue 5 , 2008 , Pages 405-410 ; 09214534 (ISSN) ; Khan, N. A ; Ahadian, M. M ; Iraji zad, A ; Sharif University of Technology
2008
Abstract
A comparison of X-ray photoemission spectroscopy of Mg doped Cu0.5Tl0.5Ba2Ca1.5Mg 0.5Cu3O10-δ and Mg free Cu0.5Tl0.5Ba2Ca2Cu 3O10-δ superconductor samples have been made. The main objective of these studies is to see the effect of Mg doping in developing better inter-plane coupling among the CuO2 planes and its effects on the chemical shift of the bonding species. Through these studies it is observed that thallium is in Tl+1 oxidation state in the Cu0.5Tl0.5Ba2O4- δ charge reservoir layer in both Mg doped and Mg free samples, however, the XPS line related to Ba atoms are shifted to higher binding energy side by 0.32 eV in Mg doped sample. This chemical shift is most likely due to presence of...
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....