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High pressure effects on electronic and magnetic properties of LaOFeAs superconductor
, Article Journal of Superconductivity and Novel Magnetism ; Vol. 27, issue. 7 , 2014 , p. 1689-1692 ; Sandoghchi, M ; Akhavan, M ; Sharif University of Technology
Abstract
The effect of pressure has been studied on structural and electronic properties of LaOFeAs high-T c superconductor by ab initio density functional theory by using pseudopotential Quantum Espresso code. The lattice parameters and ionic positions in the ambient pressure and some high pressure up to 20 GPa have been calculated. The obtained data versus the simple scaling relation for the ionic positions and distances for mechanical pressures have been discussed. The results of band structure and magnetic moment calculations of this compound versus the applied pressure are presented in this paper. The results are compared with the other experimental and computational data in the literature
Synthesis and characterization of YBaCu2O5-δ compound
, Article Physica C: Superconductivity and its Applications ; Volume 548 , 15 May , 2018 , Pages 112-115 ; 09214534 (ISSN) ; Sandoghchi, M ; Mokhtari, P ; Akhavan, M ; Sharif University of Technology
Elsevier B.V
2018
Abstract
YBaCu2O5 compound as one of the possible microstructures of Y3Ba5Cu8O19 has been synthesized. The X-ray diffraction analysis of this compound indicates that its formation is accompanied with the formation of YBa2Cu3O7-δ. The observed superconductivity around ∼92 K supports this. So, it seems that YBa2Cu3O7-δ is responsible for the observed superconductivity in YBaCu2O5, and this phase is not an independent superconducting phase. Consequently, the overall effect of the YBaCu2O5 formation during the Y3Ba5Cu8O19 fabrication process could be a reduction in Tc. © 2018 Elsevier B.V